Change the item menu to allow the watch icon to change depending on

whether the item is currently being watched.  Currently the icon is
the same as the add icon and needs to be changed.

modules/notification/helpers/notification_menu.php

@@ -24,12 +24,14 @@ class notification_menu_Core {
       $item = $theme->item();
 
       if ($item) {
+        $watching = notification::is_watching($item);
+
         $menu
           ->append(Menu::factory("link")
                ->id("watch")
                ->label(t("Enable notifications for this album"))
                ->url(url::site("notification/watch/$item->id"))
-               ->css_id("gWatchLink"));
+                   ->css_id($watching ? "gRemoveWatchLink" : "gAddWatchLink"));
       }
     }
   }