change chevron position for branch sort order dropdown menu

app/views/projects/branches/index.html.haml

@@ -12,7 +12,7 @@
         = search_field_tag :search, params[:search], { placeholder: 'Filter by branch name', id: 'branch-search', class: 'form-control search-text-input input-short', spellcheck: false }
 
       .dropdown.inline
-        %button.dropdown-toggle{type: 'button', 'data-toggle' => 'dropdown'}
+        %button.dropdown-menu-toggle{type: 'button', 'data-toggle' => 'dropdown'}
           %span.light
             = projects_sort_options_hash[@sort]
           = icon('chevron-down')