fixes [`InputDecoration.applyDefaults` ignores some properties](https://github.com/flutter/flutter/issues/127330)

<details> 
<summary>code sample</summary> 

```dart
import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(useMaterial3: true),
      home: const Example(),
    );
  }
}

class Example extends StatelessWidget {
  const Example({super.key});

  @override
  Widget build(BuildContext context) {
    const TextStyle textStyle = TextStyle(color: Color(0xFF00FFFF));
    const Color color = Color(0xFF00FF00);
    const InputBorder inputBorder = OutlineInputBorder(
      borderSide: BorderSide(
        color: Color(0xFF0000FF),
      ),
    );

    final InputDecoration appliedDefaults =
        const InputDecoration().applyDefaults(
      const InputDecorationTheme(
        labelStyle: textStyle,
        floatingLabelStyle: textStyle,
        helperStyle: textStyle,
        helperMaxLines: 2,
        hintStyle: textStyle,
        errorStyle: textStyle,
        errorMaxLines: 2,
        floatingLabelBehavior: FloatingLabelBehavior.never,
        floatingLabelAlignment: FloatingLabelAlignment.center,
        isDense: true,
        contentPadding: EdgeInsets.all(1.0),
        iconColor: color,
        prefixStyle: textStyle,
        prefixIconColor: color,
        suffixStyle: textStyle,
        suffixIconColor: color,
        counterStyle: textStyle,
        filled: true,
        fillColor: color,
        focusColor: color,
        hoverColor: color,
        errorBorder: inputBorder,
        focusedBorder: inputBorder,
        focusedErrorBorder: inputBorder,
        disabledBorder: inputBorder,
        enabledBorder: inputBorder,
        border: InputBorder.none,
        alignLabelWithHint: true,
        constraints: BoxConstraints(
            minWidth: 10, maxWidth: 20, minHeight: 30, maxHeight: 40),
      ),
    );

    return Scaffold(
      appBar: AppBar(
        title: const Text('InputDecoration().applyDefaults'),
      ),
      // Centered FilledButton.
      body: Center(
        child: SingleChildScrollView(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              ColoredBox(
                color: appliedDefaults.labelStyle.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.labelStyle.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.floatingLabelStyle
                        .toString()
                        .contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.floatingLabelStyle.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.helperStyle.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.helperStyle.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.hintStyle.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.hintStyle.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.errorStyle.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.errorStyle.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.iconColor.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.iconColor.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.prefixStyle.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.prefixStyle.toString()),
              ),
              ColoredBox(
                color:
                    appliedDefaults.prefixIconColor.toString().contains('null')
                        ? Colors.red
                        : Colors.green,
                child: Text(appliedDefaults.prefixIconColor.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.suffixStyle.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.suffixStyle.toString()),
              ),
              ColoredBox(
                color:
                    appliedDefaults.suffixIconColor.toString().contains('null')
                        ? Colors.red
                        : Colors.green,
                child: Text(appliedDefaults.suffixIconColor.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.counterStyle.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.counterStyle.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.fillColor.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.fillColor.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.focusColor.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.focusColor.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.hoverColor.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.hoverColor.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.errorBorder.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.errorBorder.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.focusedBorder.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.focusedBorder.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.focusedErrorBorder
                        .toString()
                        .contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.focusedErrorBorder.toString()),
              ),
              ColoredBox(
                color:
                    appliedDefaults.disabledBorder.toString().contains('null')
                        ? Colors.red
                        : Colors.green,
                child: Text(appliedDefaults.disabledBorder.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.enabledBorder.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.enabledBorder.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.border.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.border.toString()),
              ),
              ColoredBox(
                color: appliedDefaults.constraints.toString().contains('null')
                    ? Colors.red
                    : Colors.green,
                child: Text(appliedDefaults.constraints.toString()),
              ),
            ],
          ),
        ),
      ),
    );
  }
}
``` 
	
</details>

### Before

![before screenshot](https://github.com/flutter/flutter/assets/48603081/ae564e15-4029-4feb-810f-e46b9312a257)

### After
![after screenshot](https://github.com/flutter/flutter/assets/48603081/8924a1d8-ffde-494b-bf44-66dab4d28845)