Release proximity wakelock on Element Call when call ends

[jmartinesp]

Content

The CoroutineScope that launched this logic was cancelled by that point, so the wakelock was never released. Since the call already ended it should be OK to skip the mutex and ensure the wakelock is released in the main thread.

Motivation and context

Replacement of #6752.

Fixes #6815.

Tests

• In a DM, start a voice call.
• Don't answer it and let it automatically end with a timeout.
• Check the proximity sensor is no longer active, dimming the screen brightness when you place your device next to your ear.

Tested devices

• Physical
• Emulator
• OS version(s): 15

Checklist

• This PR was made with the help of AI:
  • Yes. In this case, please request a review by Copilot.
  • No.
• Changes have been tested on an Android device or Android emulator with API 24
• 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 defines what will change for the user
• Pull request includes screenshots or videos if containing UI changes
• You've made a self review of your PR

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.27%. Comparing base (42c1411) to head (6371281).

Files with missing lines	Patch %	Lines
...id/features/call/impl/utils/WebViewAudioManager.kt	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #6825   +/-   ##
========================================
  Coverage    81.26%   81.27%           
========================================
  Files         2648     2648           
  Lines        74170    74168    -2     
  Branches      9622     9622           
========================================
  Hits         60277    60277           
+ Misses       10341    10339    -2     
  Partials      3552     3552           

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[github-actions]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[ganfra]

LGTM