fix disco pane URL for recs

apps/discovery/templates/discovery/pane.html

@@ -7,7 +7,7 @@
 
 {% block bodyattrs %}
 data-services-url="{{ settings.SERVICES_URL }}"
-data-recs-url="{{ url('discovery.recs') }}"
+data-recs-url="{{ services_url('discovery.recs') }}"
 data-browser-version="{{ version }}"
 data-browser-platform="{{ platform }}"
 {% endblock %}