Can only open a new page once in a dialog

**Description**

Can only open a new page once in a dialog

**My suggested solution**

Open new page again when click button

**Reproduction code**

```dart
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:get_demo/main.dart';
import 'package:get_demo/second_page.dart';

class HomePage extends StatefulWidget {
@override
_HomePageState createState() => _HomePageState();
}

class _HomePageState extends State {
@override
initState() {
super.initState();
WidgetsBinding.instance.addObserver(this);
Future.delayed(Duration(milliseconds: 500), () {
Get.dialog(Material(
type: MaterialType.transparency,
child: Container(
// color: Colors.deepPurple,
child: Center(
child: RaisedButton(
child: Text('to second'),
onPressed: () async {
// Get.back();
Get.toNamed('/second');
},
),
),
),
));
});
}

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('HomePage')),
body: Container(
color: Colors.white,
child: Center(
child: RaisedButton(child: Text('to second page'), onPressed: () => Get.toNamed('/second')),
),
),
);
}
}
```

**To Reproduce**

Steps to reproduce the behavior:
1. Click on button to second page
2. Close second page
3. Click on button to second page again

**Expected behavior**

Can open new page again

**Flutter Version:**

flutter 1.22.5 stable channel

**Getx Version:**

get: ^3.22.2

**Describe on which device you found the bug:**

Both android and iOS devices.