Fixes sending speakerstats for p2p and fix sending only when needed.

JitsiConferenceEventManager.js

                 conference.lastDominantSpeaker = id;
                 conference.eventEmitter.emit(
                     JitsiConferenceEvents.DOMINANT_SPEAKER_CHANGED, id);
-            }
-            if (conference.statistics && conference.myUserId() === id) {
-                // We are the new dominant speaker.
-                conference.statistics.sendDominantSpeakerEvent(
-                    conference.room.roomjid);
+
+                if (conference.statistics && conference.myUserId() === id) {
+                    // We are the new dominant speaker.
+                    conference.statistics.sendDominantSpeakerEvent(
+                        conference.room.roomjid);
+                }
             }
         });
 

modules/P2PDominantSpeakerDetection.js

 import * as JitsiConferenceEvents from '../JitsiConferenceEvents';
+import RTCEvents from '../service/RTC/RTCEvents';
 
 /**
  * The value which we use to say, every sound over this threshold
             return;
         }
 
-        this.conference.eventEmitter.emit(
-            JitsiConferenceEvents.DOMINANT_SPEAKER_CHANGED,
+        this.conference.rtc.eventEmitter.emit(
+            RTCEvents.DOMINANT_SPEAKER_CHANGED,
             id);
     }
 }