Removes unused event ('InLastNChangeEvent').

JitsiConferenceEventManager.js

             { value: now });
     });
 
-    this.rtcForwarder.forward(RTCEvents.LASTN_CHANGED,
-        JitsiConferenceEvents.IN_LAST_N_CHANGED);
-
     this.rtcForwarder.forward(RTCEvents.LASTN_ENDPOINT_CHANGED,
         JitsiConferenceEvents.LAST_N_ENDPOINTS_CHANGED);
 

JitsiConferenceEvents.js

  */
 export const ENDPOINT_MESSAGE_RECEIVED = 'conference.endpoint_message_received';
 
-/**
- * You are included / excluded in somebody's last N set
- */
-export const IN_LAST_N_CHANGED = 'conference.inLastNChanged';
-
 /**
  * You are kicked from the conference.
  */

modules/RTC/DataChannels.js

                     dominantSpeakerEndpoint);
                 self.eventEmitter.emit(RTCEvents.DOMINANT_SPEAKER_CHANGED,
                   dominantSpeakerEndpoint);
-            } else if (colibriClass === 'InLastNChangeEvent') {
-                let oldValue = obj.oldValue;
-                let newValue = obj.newValue;
-
-                // Make sure that oldValue and newValue are of type boolean.
-                let type;
-
-                if ((type = typeof oldValue) !== 'boolean') {
-                    if (type === 'string') {
-                        oldValue = oldValue === 'true';
-                    } else {
-                        oldValue = Boolean(oldValue);
-                    }
-                }
-                if ((type = typeof newValue) !== 'boolean') {
-                    if (type === 'string') {
-                        newValue = newValue === 'true';
-                    } else {
-                        newValue = Boolean(newValue);
-                    }
-                }
-
-                self.eventEmitter.emit(
-                    RTCEvents.LASTN_CHANGED,
-                    oldValue,
-                    newValue);
             } else if (colibriClass === 'LastNEndpointsChangeEvent') {
                 // The new/latest list of last-n endpoint IDs.
                 const lastNEndpoints = obj.lastNEndpoints;

service/RTC/RTCEvents.js

     RTC_READY: 'rtc.ready',
     DATA_CHANNEL_OPEN: 'rtc.data_channel_open',
     ENDPOINT_CONN_STATUS_CHANGED: 'rtc.endpoint_conn_status_changed',
-    LASTN_CHANGED: 'rtc.lastn_changed',
     DOMINANT_SPEAKER_CHANGED: 'rtc.dominant_speaker_changed',
     LASTN_ENDPOINT_CHANGED: 'rtc.lastn_endpoint_changed',
     AVAILABLE_DEVICES_CHANGED: 'rtc.available_devices_changed',