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/layout.js

@@ -109,7 +109,7 @@ LayoutManager.prototype = {
             let corner = new HotCorner();
             this._hotCorners.push(corner);
             corner.actor.set_position(cornerX, cornerY);
-            Main.chrome.addActor(corner.actor, { affectsStruts: false });
+            Main.chrome.addActor(corner.actor);
         }
     },