Merge branch 'voip/fix-black-screen-with-system-button' into 'main'

fix: Fix black screen when end screensharing with system buttons.

Closes famedly-web#268

See merge request famedly/company/frontend/famedlysdk!955

lib/src/voip.dart

@@ -538,6 +538,11 @@ class CallSession {
         if (stream == null) {
           return false;
         }
+        stream.getVideoTracks().forEach((track) {
+          track.onEnded = () {
+            setScreensharingEnabled(false);
+          };
+        });
         _addLocalStream(stream, SDPStreamMetadataPurpose.Screenshare);
         return true;
       } catch (err) {