Fix active menu state on settings navigation

closes #4622
- unfocus ActivatingListItem link when clicked

ghost/admin/components/gh-activating-list-item.js

@@ -1,7 +1,11 @@
 var ActivatingListItem = Ember.Component.extend({
     tagName: 'li',
     classNameBindings: ['active'],
-    active: false
+    active: false,
+
+    unfocusLink: function () {
+        this.$('a').blur();
+    }.on('click')
 });
 
 export default ActivatingListItem;