[web] Re-enable test now that source of flakiness is fixed (flutter#140462)

The test was flaky before due to overflowing GPU memory during the test.
The memory leak was fixed here
flutter/engine#49214

Fixes flutter#137669

As a side effect of the fix, this test also runs much faster, from about
3 minutes on my Macbook down to about 25 seconds.

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Author: harryterkelsen

packages/flutter/test/cupertino/text_field_test.dart

@@ -8390,13 +8390,10 @@ void main() {
     final EditableText editableText = tester.firstWidget(find.byType(EditableText));
     expect(editableText.clipBehavior, Clip.none);
 
-    // TODO(harryterkelsen): see https://github.com/flutter/flutter/issues/137669
-    if (!kIsWeb || !isCanvasKit) {
-      await expectLater(
-        find.byKey(const ValueKey<int>(1)),
-        matchesGoldenFile('overflow_clipbehavior_none.cupertino.0.png'),
-      );
-    }
+    await expectLater(
+      find.byKey(const ValueKey<int>(1)),
+      matchesGoldenFile('overflow_clipbehavior_none.cupertino.0.png'),
+    );
   });
 
   testWidgets('can shift + tap to select with a keyboard (Apple platforms)', (WidgetTester tester) async {