message: fix wrong way of unregistering from store
diff: @@ -274,14 +274,14 @@ module.exports = React.createClass({
  if (this._roomListStoreToken) {
  this._roomListStoreToken.remove();
  }
  + if (this._customTagStoreToken) {
  + this._customTagStoreToken.remove();
  + }
  // NB: GroupStore is not a Flux.Store
  if (this._groupStoreToken) {
  this._groupStoreToken.unregister();
  }
  - if (this._customTagStoreToken) {
  - this._customTagStoreToken.unregister();
  - }
  // cancel any pending calls to the rate_limited_funcs
  this._delayedRefreshRoomList.cancelPendingCall();
  