Merge pull request #3090 from projectblacklight/jcoyne-patch-2

Remove unused bootstrap 3 class

app/views/catalog/_advanced_search_form.html.erb

@@ -1,6 +1,6 @@
 <%= render(Blacklight::AdvancedSearchFormComponent.new(
       url: search_action_url,
-      classes: ['advanced', 'form-horizontal'],
+      classes: ['advanced'],
       params: search_state.params_for_search.except(:qt),
       response: @response
     )) %>