Fix the paste button label in the new version of the filtered text pasting test (#59865)

packages/flutter/test/material/text_field_test.dart

@@ -3282,7 +3282,7 @@ void main() {
     await tester.pump(const Duration(milliseconds: 200)); // skip past the frame where the opacity is zero
 
     Clipboard.setData(const ClipboardData(text: '一4二\n5三6'));
-    await tester.tap(find.text('PASTE'));
+    await tester.tap(find.text('Paste'));
     await tester.pump();
     // Puts 456 before the 2 in 123.
     expect(textController.text, '145623');