popover trigger needs to be defined in js init

According to https://github.com/twbs/bootstrap/issues/10547 it's not
possible to have the trigger defined on the delegated element, i.e. not
defined as a data attribute.

app/assets/javascripts/main.js

@@ -251,7 +251,8 @@ $(function () {
   });
   // Initialize popovers
   $body.popover({
-    selector: '[data-toggle="popover"]'
+    selector: '[data-toggle="popover"]',
+    trigger: 'focus'
   });
   $('.trigger-submit').on('change', function () {
     return $(this).parents('form').submit();

app/helpers/commits_helper.rb

@@ -283,7 +283,6 @@ module CommitsHelper
       toggle: 'popover',
       html: 'true',
       placement: 'auto bottom',
-      trigger: 'focus',
       title: title,
       content: content
     }