fix(Listenable) fix not adding cancellable listeners after refactor

modules/xmpp/ChatRoom.js

@@ -234,7 +234,7 @@ export default class ChatRoom extends Listenable {
             preJoin.then(() => {
                 this.sendPresence(true);
                 this._removeConnListeners.push(
-                    this.connection.addEventListener(
+                    this.connection.addCancellableListener(
                         XmppConnection.Events.CONN_STATUS_CHANGED,
                         this.onConnStatusChanged.bind(this))
                 );

modules/xmpp/JingleSessionPC.js

@@ -349,7 +349,7 @@ export default class JingleSessionPC extends JingleSession {
 
         this._xmppListeners = [];
         this._xmppListeners.push(
-            connection.addEventListener(
+            connection.addCancellableListener(
                 XmppConnection.Events.CONN_STATUS_CHANGED,
                 this.onXmppStatusChanged.bind(this))
         );