urls: use pyramid routing for support tracker link.

rhodecode/templates/admin/settings/settings_visual.mako

@@ -200,7 +200,7 b''
                 ${_('''Custom url for the support link located at the bottom.
                     The default is set to %(default_url)s. In case there's a need
                     to change the support link to internal issue tracker, it should be done here.
-                    ''') % {'default_url': h.url('rhodecode_support')}}
+                    ''') % {'default_url': h.route_url('rhodecode_support')}}
             </span>
         </div>
     </div>