Fix black-on-black status bars with hidden media

[frebib]

Content

In dark mode, the ElementTheme composable incorrectly applied a dark colour to the status bars, which was nearly invisible on top of the black background of the app.

Motivation and context

Regression fix for #3592

Screenshots / GIFs

Fixes this:

Tests

• Step 1
• Step 2
• Step ...

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/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly define what will change for the user
• 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

[github-actions]

Thank you for your contribution! Here are a few things to check in the PR to ensure it's reviewed as quickly as possible:

• Your branch should be based on origin/develop, at least when it was created.
• The title of the PR will be used for release notes, so it needs to describe the change visible to the user.
• The test pass locally running ./gradlew test.
• The code quality check suite pass locally running ./gradlew runQualityChecks.
• If you modified anything related to the UI, including previews, you'll have to run the Record screenshots GH action in your forked repo: that will generate compatible new screenshots. However, given Github Actions limitations, it will prevent the CI from running temporarily, until you upload a new commit after that one. To do so, just pull the latest changes and push an empty commit.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.66%. Comparing base (4319a42) to head (0b67dfd).
Report is 7 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3611      +/-   ##
===========================================
- Coverage    82.67%   82.66%   -0.02%     
===========================================
  Files         1737     1737              
  Lines        41214    41214              
  Branches      5003     5003              
===========================================
- Hits         34073    34068       -5     
- Misses        5372     5373       +1     
- Partials      1769     1773       +4     

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[bmarty]

Ah, good catch, thanks!