Fix the next button disable issue after visiting homeserver screen

[ByeongsuPark]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

Fix the next button disabled issue after going to change homeserver screen.
The initial emission of flow is an empty string when coming back after visiting homeserver screen.
Because at that time(onViewCreated) the view's state is not restored yet.
Collecting flow after onViewStateRestored can be the one way to solve this problem.
So flowWithLifecycle() is added to collect flow after onViewStateRestored is called.

Motivation and context

Fix #7928

Screenshots / GIFs

Before	After
default.mp4	default.mp4
-->

Tests

Same steps as mentioned in the issue #7928

Tested devices

• Physical
• OS version(s): API 33
• Emulator
• OS version(s): API 21

Checklist

• Changes has been tested on an Android device or Android emulator with API 21
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/vector-im/element-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request includes a new file under ./changelog.d. See https://github.com/vector-im/element-android/blob/develop/CONTRIBUTING.md#changelog
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• [=] You've made a self review of your PR
• If you have modified the screen flow, or added new screens to the application, you have updated the test UiAllScreensSanityTest.allScreensTest()

[bmarty]

Perfect, thanks!

[bmarty]

TIL