hide RoomStatusBar when not needed again

as it will be shown a lot less now, having the layout
jump up and down won't be so much of a problem.

src/components/structures/RoomView.js

@@ -1473,11 +1473,10 @@ module.exports = React.createClass({
 
     onStatusBarHidden: function() {
         // This is currently not desired as it is annoying if it keeps expanding and collapsing
-        // TODO: Find a less annoying way of hiding the status bar
-        /*if (this.unmounted) return;
+        if (this.unmounted) return;
         this.setState({
             statusBarVisible: false,
-        });*/
+        });
     },
 
     /**