message: Re-add dispatcher as alt-up/down uses it
  Alt-up/down still doesn't go through rooms in the right order,
  but it should probably not error.
diff: @@ -21,6 +21,7 @@ import KeyCode from '../../KeyCode';
  import Notifier from '../../Notifier';
  import PageTypes from '../../PageTypes';
  import sdk from '../../index';
  +import dis from '../../dispatcher';
  /**
  * This is what our MatrixChat shows when we are logged in. The precise view is
  