Enable Element Call FF by default.

[pixlwave]

• Enabled by default rather than removed for now. Aligns with the same change on Android: Enable Element Call integration in rooms by default element-x-android#1685
• Remove the unused FF for mention pills.

[github-actions]

	Warnings
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.

Generated by 🚫 Danger Swift against 3c3b7fc

[nimau]

LGTM

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e9cdc76) 69.20% compared to head (3c3b7fc) 69.23%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1983      +/-   ##
===========================================
+ Coverage    69.20%   69.23%   +0.03%     
===========================================
  Files          518      518              
  Lines        35708    35708              
  Branches     17318    17318              
===========================================
+ Hits         24712    24723      +11     
+ Misses       10347    10333      -14     
- Partials       649      652       +3     

Flag	Coverage Δ
unittests	54.31% <ø> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
ElementX/Sources/Application/AppSettings.swift	96.82% <ø> (ø)

... and 6 files with indirect coverage changes

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