Consistently exit the overview when launching external applications

We were doing this in one or two places, but not most of them.

https://bugzilla.gnome.org/show_bug.cgi?id=653095

js/ui/status/bluetooth.js

@@ -90,6 +90,7 @@ Indicator.prototype = {
         this._updateFullMenu();
 
         this.menu.addAction(_("Bluetooth Settings"), function() {
+            Main.overview.hide()
             let app = Shell.AppSystem.get_default().get_app('bluetooth-properties.desktop');
             app.activate(-1);
         });