Change dashboard snippet index menu class to match test

app/views/dashboard/snippets/index.html.haml

@@ -9,7 +9,7 @@
       = icon('plus')
       New Snippet
 
-  .btn-group.btn-group-next.event-filter
+  .btn-group.btn-group-next.snippet-scope-menu
     = link_to dashboard_snippets_path, class: "btn btn-default #{"active" unless params[:scope]}" do
       All
       %span.badge