use helper for attachments list

app/views/cost_objects/_form.html.erb

@@ -45,5 +45,5 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 <div style="clear: both;"> </div>
 
-<attachments data-resource="<%= resource.to_json %>" data-allow-uploading="true"></attachments>
+<%= list_attachments(resource, true) %>
 

app/views/cost_objects/show.html.erb

@@ -90,7 +90,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
   </div>
 
   <% resource = budget_attachment_representer(@cost_object) %>
-  <attachments data-resource="<%= resource.to_json %>" data-allow-uploading="false"></attachments>
+  <%= list_attachments(resource) %>
 
   <%= render :partial => "show_variable_cost_object" %>
 </div>