Make the build result popovers clickable

This solves two issues:

* On mobile devices the popovers were not accessible due to the hover
* Clicking on a popover makes it stick, which allows users to c&p the
  popover message. Since these messages can be quite specific,
  containing package names and versions, this can be very useful.

src/api/app/assets/javascripts/webui2/buildresult.js

@@ -30,7 +30,7 @@ function updateBuildResult(index) { // jshint ignore:line
     },
     complete: function() {
       $('#build' + index + '-reload').removeClass('fa-spin');
-      $('[data-toggle="popover"]').popover({ trigger: 'hover' });
+      $('[data-toggle="popover"]').popover({ trigger: 'hover click' });
     }
   });
 }