Focus composer after closing room settings

For some reason the slate update means the composer doesn't
have the focus after closing the room settings, and the end to end
tests pick this up!

src/components/structures/RoomView.js

@@ -195,6 +195,8 @@ module.exports = React.createClass({
             editingRoomSettings: RoomViewStore.isEditingSettings(),
         };
 
+        if (this.state.editingRoomSettings && !newState.editingRoomSettings) dis.dispatch({action: 'focus_composer'});
+
         // Temporary logging to diagnose https://github.com/vector-im/riot-web/issues/4307
         console.log(
             'RVS update:',