Convert dashboard test into a system test

Allows to remove an id used only for testing.

app/views/dashboards/show.html.erb

@@ -38,7 +38,7 @@
             <li><%= link_to t(".friends_diaries"), friends_diary_entries_path %></li>
           </ul>
         </nav>
-        <div id="friends-container">
+        <div>
           <%= render :partial => "contact", :collection => friends, :locals => { :type => "friend" } %>
         </div>
       <% end %>