Update Stateful widget generator

[rafaeljustinox]

Update Stateful widget generator

Instead of:

class Example extends StatefulWidget {
  const Example({ Key? key }) : super(key: key);

  @override
  _ExampleState createState() => _ExampleState();
}

class _ExampleState extends State<Example> {
  @override
  Widget build(BuildContext context) {
     return Container(
			
      );
    }
}

Do this:

class Example extends StatefulWidget {
  const Example({super.key});

  @override
  State<Example> createState() => _ExampleState();
}

class _ExampleState extends State<Example> {
  @override
  Widget build(BuildContext context) {
    return Container();
  }
}

[rafaeljustinox]

cc: @Alexisvt