fix(logging) Do not print 'Fowarded sources changed' log multiple times.

modules/RTC/RTC.js

         const oldForwardedSources = this._forwardedSources || [];
         let leavingForwardedSources = [];
         let enteringForwardedSources = [];
+        const timestamp = Date.now();
 
         this._forwardedSources = forwardedSources;
 
         enteringForwardedSources = forwardedSources.filter(
             sourceName => oldForwardedSources.indexOf(sourceName) === -1);
 
+        logger.debug(`Fowarded sources changed leaving=${leavingForwardedSources}, entering=`
+            + `${enteringForwardedSources} at ${timestamp}`);
         this.conference.eventEmitter.emit(
             JitsiConferenceEvents.FORWARDED_SOURCES_CHANGED,
             leavingForwardedSources,
             enteringForwardedSources,
-            Date.now());
+            timestamp);
     }
 
     /**

modules/connectivity/TrackStreamingStatus.ts

 
         const sourceName = this.track.getSourceName();
 
-        logger.debug(`Fowarded sources changed leaving=${leavingForwardedSources}, entering=${
-            enteringForwardedSources} at ${timestamp}`);
-
         // If the browser doesn't fire the mute/onmute events when the remote peer stops/starts sending media,
         // calculate the streaming status for all the tracks since it won't get triggered automatically on the track
         // that has started/stopped receiving media.