[FormBuilderDropdown]: Not reverting to initial value upon form reset

Is there an existing issue for this?

[X] I have searched the existing issues

Package/Plugin version

9.3.0

Platforms

[ ] Android
[X] iOS
[ ] Linux
[ ] MacOS
[ ] Web
[ ] Windows

Flutter doctor

```bash Doctor summary (to see all details, run flutter doctor -v): [✓] Flutter (Channel stable, 3.22.1, on macOS 14.5 23F79 darwin-arm64, locale en-AU) [✓] Android toolchain - develop for Android devices (Android SDK version 33.0.2) [✓] Xcode - develop for iOS and macOS (Xcode 15.4) [✓] Chrome - develop for the web [✓] Android Studio (version 2022.1) [✓] IntelliJ IDEA Community Edition (version 2023.2.2) [✓] VS Code (version 1.89.1) [✓] Connected device (5 available) [✓] Network resources • No issues found! ```

Minimal code example

Code sample

```dart class MyForm extends StatefulWidget { const MyForm({super.key}); @override _MyFormState createState() => _MyFormState(); } class _MyFormState extends State { final _formKey = GlobalKey(); @override Widget build(BuildContext context) { return Padding( padding: const EdgeInsets.all(16.0), child: FormBuilder( key: _formKey, child: Column( children: [ FormBuilderDropdown( name: 'dropdown', decoration: const InputDecoration( labelText: 'Select Option', ), // hint: Text('Select Option'), // Optional items: const [ DropdownMenuItem( value: 'Option 1', child: Text('Option 1'), ), DropdownMenuItem( value: 'Option 2', child: Text('Option 2'), ), DropdownMenuItem( value: 'Option 3', child: Text('Option 3'), ), ], ), const SizedBox(height: 20), ElevatedButton( onPressed: () { print("BEFORE RESET"); print(_formKey.currentState?.value); _formKey.currentState?.reset(); print("AFTER RESET"); print(_formKey.currentState?.value); }, child: const Text('Reset'), ), ], ), ), ); } } ```

Current Behavior

The dropdown field is not reverting to the initial value upon form reset. It instead retains the value that has been selected prior to reset.

Expected Behavior

Dropdown field should be reset to initial value when the form is reset

Steps To Reproduce

Run app
Dropdown field has initial value as null. Select an option
Press reset button

Aditional information

flutter: BEFORE RESET
flutter: {dropdown: Option 2}
flutter: AFTER RESET
flutter: {dropdown: Option 2}

flutter-form-builder-ecosystem / flutter_form_builder