Remove usages of the top-bar-right class

This is one of Foundation's classes that only applies when its
parent element is a flex container, which isn't the case here since
commit dcec003d0.

app/components/layout/admin_header_component.html.erb

@@ -29,9 +29,7 @@
 
       <% if show_account_menu? %>
         <div id="responsive_menu">
-          <div class="top-bar-right">
-            <%= render Layout::AccountMenuComponent.new(user) %>
-          </div>
+          <%= render Layout::AccountMenuComponent.new(user) %>
         </div>
       <% end %>
     </div>