message: Add token.remove() handling to room list temp proxy
  Fixes
diff: @@ -31,11 +31,14 @@ export class RoomListStoreTempProxy {
  return SettingsStore.isFeatureEnabled("feature_new_room_list");
  }
  - public static addListener(handler: () => void) {
  + public static addListener(handler: () => void): RoomListStoreTempToken {
  if (RoomListStoreTempProxy.isUsingNewStore()) {
  - return RoomListStore.instance.on(UPDATE_EVENT, handler);
  + const offFn = () => RoomListStore.instance.off(UPDATE_EVENT, handler);
  + RoomListStore.instance.on(UPDATE_EVENT, handler);
  + return new RoomListStoreTempToken(offFn);
  } else {
  - return OldRoomListStore.addListener(handler);
  + const token = OldRoomListStore.addListener(handler);
  + return new RoomListStoreTempToken(() => token.remove());
  }
  }
  @@ -47,3 +50,13 @@ export class RoomListStoreTempProxy {
  }
  }
  }
  +
  +
  +export class RoomListStoreTempToken {
  + constructor(private offFn: () => void) {
  + }
  +
  + public remove(): void {
  + this.offFn();
  + }
  +}
  