layout: Remove affectsInputRegion

This can easy be worked around by adding things to the uiGroup
instead, so there's really no reason to have it here still.

https://bugzilla.gnome.org/show_bug.cgi?id=700735

js/ui/osdWindow.js

@@ -107,7 +107,7 @@ const OsdWindow = new Lang.Class({
                                    Lang.bind(this, this._monitorsChanged));
         this._monitorsChanged();
 
-        Main.layoutManager.addChrome(this.actor, { affectsInputRegion: false });
+        Main.uiGroup.add_child(this.actor);
     },
 
     setIcon: function(icon) {