fix: Fixes mute to stop forwarding stream.

[damencho]

This works only in the case when a streams are being forwarded (no transcoding).

[codecov]

Codecov Report

❌ Patch coverage is 0% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 19.32%. Comparing base (37d0eab) to head (c862b5e).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
.../main/java/org/jitsi/jigasi/SipGatewaySession.java	0.00%	7 Missing and 1 partial ⚠️
...rc/main/java/org/jitsi/jigasi/AudioModeration.java	0.00%	7 Missing ⚠️
...main/java/org/jitsi/jigasi/SipCallTransformer.java	0.00%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #606      +/-   ##
============================================
+ Coverage     19.21%   19.32%   +0.10%     
- Complexity      309      313       +4     
============================================
  Files            83       83              
  Lines          7168     7179      +11     
  Branches        951      953       +2     
============================================
+ Hits           1377     1387      +10     
- Misses         5562     5563       +1     
  Partials        229      229              

Files with missing lines	Coverage Δ
...rc/main/java/org/jitsi/jigasi/AudioModeration.java	13.30% <0.00%> (-0.19%)	⬇️
...main/java/org/jitsi/jigasi/SipCallTransformer.java	0.00% <0.00%> (ø)
.../main/java/org/jitsi/jigasi/SipGatewaySession.java	44.14% <0.00%> (-0.09%)	⬇️

... and 5 files with indirect coverage changes

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