Show full history if key backup is enabled.

[bmarty]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

If KeyBackup is enabled, do not show the no history banner in encrypted room.

Motivation and context

Closes #1768

Screenshots / GIFs

Tests

• Log in to an account with a e2e room RoomA with messages.
• Verify the session
• Open RoomA and see that the banner is displayed
• From the setting, enter the recovery key to unlock the chat backup
• open the RoomA
• observe that the history of the room is visible (and decrypted if the keys are in the backup)

Before this PR, the banner was always displayed, event if the history was present and decrypted.

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/vector-im/element-x-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-x-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

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[github-actions]

📱 Scan the QR code below to install the build (arm64 only) for this PR.

If you can't scan the QR code you can install the build via this link: https://i.diawi.com/ePUnMx

[ganfra]

This is not dynamic if the KeyBackUp is enabled/disabled while in a room, but I guess it's no big deal :-)

[bmarty]

This is not dynamic if the KeyBackUp is enabled/disabled while in a room, but I guess it's no big deal :-)

No, but I do not think it's possible, since the user will need to go back to the room list to go to the settings.