location: Provide a way to disable geolocation

Now that we are indicating 'geolocation in use' to user, we better also
provide at least a way to disable geolocation. Once this is in place, we
can provide slightly better controls rather than simply on/off switch.

https://bugzilla.gnome.org/show_bug.cgi?id=723684

js/ui/panel.js

@@ -853,6 +853,7 @@ const AggregateMenu = new Lang.Class({
         if (this._bluetooth) {
             this.menu.addMenuItem(this._bluetooth.menu);
         }
+        this.menu.addMenuItem(this._location.menu);
         this.menu.addMenuItem(this._rfkill.menu);
         this.menu.addMenuItem(this._power.menu);
         this.menu.addMenuItem(new PopupMenu.PopupSeparatorMenuItem());