[Location sharing] - Small improvements of UI for live (PSG-613)

[mnaturel]

Type of change

• Feature
• Bugfix
• Technical
• Other : Enhancement

Content

This contains some fixes on the UX for live location sharing message in timeline. See #6607 for more info.

Motivation and context

Closes #6607

Screenshots / GIFs

Tests

• Go to a room
• Start a live location share
• Check the loading state item is correct
• Check the active state item is correct
• End the live
• Check the ended state item is correct
• Reply to the live
• Check the message preview is correct
• Switch dark/light theme if you can
• Re-do the previous steps

Tested devices

• Physical
• Emulator
• OS version(s): Android 11

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()

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
0.0% Duplication

[fedrunov]

LGTM