Use updated API to leave the current call.

Signed-off-by: Joachim Bauch <bauch@struktur.de>

js/views/roomlistview.js

@@ -336,8 +336,7 @@
 
 			//If user is in that room, it should leave that room first.
 			if (this.model.get('active')) {
-				OCA.SpreedMe.Rooms.leaveCurrentRoom();
-				OCA.SpreedMe.Rooms.showRoomDeletedMessage(true);
+				OCA.SpreedMe.Calls.leaveCurrentCall(true);
 				OC.Util.History.pushState({}, OC.generateUrl('/apps/spreed'));
 			}