chrome: Make affectsStruts default to false

Since we only want it to be true for the panel, and nothing else.

https://bugzilla.gnome.org/show_bug.cgi?id=655813

js/ui/panelMenu.js

@@ -27,7 +27,7 @@ Button.prototype = {
         this.menu.actor.add_style_class_name('panel-menu');
         this.menu.connect('open-state-changed', Lang.bind(this, this._onOpenStateChanged));
         this.menu.actor.connect('key-press-event', Lang.bind(this, this._onMenuKeyPress));
-        Main.chrome.addActor(this.menu.actor, { affectsStruts: false });
+        Main.chrome.addActor(this.menu.actor);
         this.menu.actor.hide();
     },