fixes [TabBar Expands to full width of the screen isScrollable: true after upgrading to flutter 3.16.4](https://github.com/flutter/flutter/issues/140338)

---

## Description

Fixes the scrollable `TabBar` width when the divider is removed. (when the divider height is set to `0` or divider color is set to `Colors.transparent`)

### Code sample

<details>
<summary>expand to view the 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) {
    const int tabsCount = 2;

    return MaterialApp(
      home: DefaultTabController(
        initialIndex: 1,
        length: tabsCount,
        child: Scaffold(
          appBar: AppBar(
            title: const Text('TabBar Sample'),
            bottom: PreferredSize(
              preferredSize: const Size.fromHeight(48.0),
              child: ColoredBox(
                color: Theme.of(context).colorScheme.secondaryContainer,
                child:  TabBar(
                  // dividerColor: Theme.of(context).colorScheme.onSurface,
                  dividerColor: Colors.transparent, // remove divider
                  // dividerHeight: 0, // remove divider
                  isScrollable: true,
                  tabAlignment: TabAlignment.center,
                  tabs: <Widget>[
                    for (int i = 0; i < tabsCount; i++)
                      Tab(
                        text: 'Tab $i',
                      ),
                  ],
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }
}
```

</details>

### Before
![Simulator Screenshot - iPhone 15 Pro - 2024-01-04 at 15 16 15](https://github.com/flutter/flutter/assets/48603081/b776e7e6-e5f0-49df-8a79-55032eaad631)

### After
![Simulator Screenshot - iPhone 15 Pro - 2024-01-04 at 15 16 23](https://github.com/flutter/flutter/assets/48603081/9ad13793-43a9-4ae8-977e-7cf84cb59bb1)