update screenshot test to handle platform-specific UI

Author: tushar11kh

test_integration/screenshots.dart

@@ -48,7 +48,10 @@ void main() async {
       await tester.tap(speedTabText);
       await tester.pumpAndSettle();
 
-      final inputField = find.byType(ExtendedTextField);
+      final inputField = find.byWidgetPredicate(
+        (widget) => widget is ExtendedTextField || widget is TextField,
+      );
+
       await tester.tap(inputField);
       await tester.pumpAndSettle();
       tester.testTextInput.enterText('Hello');