fix(screenshare): audio screen share muted state

modules/RTC/JitsiLocalTrack.js

                 || this.videoType === VideoType.DESKTOP
                 || !browser.doesVideoMuteByStreamRemove()) {
             logMuteInfo();
-            if (this.track) {
+
+            // If we have a stream effect that implements its own mute functionality, prioritize it before
+            // normal mute e.g. the stream effect that implements system audio sharing has a custom
+            // mute state in which if the user mutes, system audio still has to go through.
+            if (this._streamEffect && this._streamEffect.setMuted) {
+                this._streamEffect.setMuted(muted);
+            } else if (this.track) {
                 this.track.enabled = !muted;
             }
         } else if (muted) {
             return true;
         }
 
+        // If currently used stream effect has its own muted state, use that.
+        if (this._streamEffect && this._streamEffect.isMuted) {
+            return this._streamEffect.isMuted();
+        }
+
         return !this.track || !this.track.enabled;
     }