fix(conference) remove dead code

Went for a different approach, this code is dead now.

conference.js

@@ -1328,7 +1328,7 @@ export default {
     /**
      * Used by the Breakout Rooms feature to join a breakout room or go back to the main room.
      */
-    async joinRoom(roomName, isBreakoutRoom = false) {
+    async joinRoom(roomName) {
         this.roomName = roomName;
 
         const { tryCreateLocalTracks, errors } = this.createInitialLocalTracks();
@@ -1341,33 +1341,15 @@ export default {
                 track.mute();
             }
         });
-        this._createRoom(localTracks, isBreakoutRoom);
+        this._createRoom(localTracks);
 
         return new Promise((resolve, reject) => {
             new ConferenceConnector(resolve, reject).connect();
         });
     },
 
-    _createRoom(localTracks, isBreakoutRoom = false) {
-        const extraOptions = {};
-
-        if (isBreakoutRoom) {
-            // We must be in a room already.
-            if (!room?.xmpp?.breakoutRoomsComponentAddress) {
-                throw new Error('Breakout Rooms not enabled');
-            }
-
-            // TODO: re-evaluate this. -saghul
-            extraOptions.customDomain = room.xmpp.breakoutRoomsComponentAddress;
-        }
-
-        room
-            = connection.initJitsiConference(
-                APP.conference.roomName,
-                {
-                    ...this._getConferenceOptions(),
-                    ...extraOptions
-                });
+    _createRoom(localTracks) {
+        room = connection.initJitsiConference(APP.conference.roomName, this._getConferenceOptions());
 
         // Filter out the tracks that are muted (except on Safari).
         const tracks = browser.isWebKitBased() ? localTracks : localTracks.filter(track => !track.isMuted());