use static url for discopane promos

apps/discovery/templates/discovery/pane.html

@@ -40,7 +40,7 @@ data-upandcoming-url="{{ services_url('discovery.pane.more_addons', 'up-and-comi
 
   <section id="main">
 
-    <section id="promos" data-promo-url="{{ url('addons.homepage_promos') }}">
+    <section id="promos" data-promo-url="{{ static(url('addons.homepage_promos')) }}">
       <ul id="nav-features">
         <li class="nav-prev"><a href="#" class="prev">{{ _('Previous') }}</a></li>
         <li class="nav-next"><a href="#" class="next">{{ _('Next') }}</a></li>