Use the right colors for @room mention pills

[jmartinesp]

Content

Since an @room mentions will also implicitly mention the current use, it should use the same color as an explicit mention to the current user.

Motivation and context

Fixes #3374.

Screenshots / GIFs

Before	After

Tests

• Open a room with an @room mention.
• Check the right colors are used.

Tested devices

• Physical
• Emulator
• OS version(s): 14

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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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.65%. Comparing base (31d0621) to head (d159136).
Report is 8 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3376      +/-   ##
===========================================
+ Coverage    82.64%   82.65%   +0.01%     
===========================================
  Files         1684     1684              
  Lines        39507    39507              
  Branches      4806     4806              
===========================================
+ Hits         32650    32654       +4     
+ Misses        5175     5173       -2     
+ Partials      1682     1680       -2     

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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 SonarCloud