Remove active class from buttons.

refs #3989
- Remove active class from {{#link-to tagName="button" ..}}

core/client/utils/link-view.js

@@ -5,5 +5,9 @@ Ember.LinkView.reopen({
         Ember.set(this, 'alternateActive', isActive);
 
         return isActive;
+    }),
+
+    activeClass: Ember.computed('tagName', function () {
+        return this.get('tagName') === 'button' ? '' : 'active';
     })
 });