message: When not specified, remove roomAlias state in RoomViewStore
diff: @@ -123,6 +123,7 @@ class RoomViewStore extends Store {
  if (payload.room_id) {
  const newState = {
  roomId: payload.room_id,
  + roomAlias: payload.room_alias,
  initialEventId: payload.event_id,
  initialEventPixelOffset: undefined,
  isInitialEventHighlighted: payload.highlighted,
  