Min size for hidden media

[bmarty]

Content

First commit: ensure that media cannot be opened full screen when it is hidden. It has to be revealed first.
Second commit: Ensure that when a media is hidden, the "Show" button is always visible in case the aspect ratio is very low or very high.

Motivation and context

Closes #3865

Screenshots / GIFs

Before	After	After, media shown

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]

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[sonarcloud]

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.94%. Comparing base (7edfefe) to head (aa1948a).
Report is 34 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3906      +/-   ##
===========================================
+ Coverage    82.91%   82.94%   +0.03%     
===========================================
  Files         1785     1787       +2     
  Lines        45164    45178      +14     
  Branches      5332     5335       +3     
===========================================
+ Hits         37446    37474      +28     
+ Misses        5847     5827      -20     
- Partials      1871     1877       +6     

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