fix: Always send presence unavailable when leaving a MUC.

[bgrozev]

No description provided.

[codecov]

Codecov Report

Merging #1122 (035dfbe) into master (067e575) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1122      +/-   ##
============================================
- Coverage     27.86%   27.85%   -0.02%     
  Complexity      473      473              
============================================
  Files           128      128              
  Lines          7783     7788       +5     
  Branches       1064     1064              
============================================
  Hits           2169     2169              
- Misses         5342     5347       +5     
  Partials        272      272              

Files	Coverage Δ
...n/kotlin/org/jitsi/jicofo/xmpp/muc/ChatRoomImpl.kt	0.00% <0.00%> (ø)

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