skip favorite_control queries

Author: drusepth

app/views/content/display/_favorite_control.html.erb

@@ -8,7 +8,7 @@
   end
 %>
 
-<% if content.persisted? && user_signed_in? && content.user == current_user %>
+<% if content.persisted? && user_signed_in? && content.user_id == current_user.try(:id) %>
   <i class="material-icons right yellow-text favorite-button tooltipped" 
     data-tooltip="<%= action %> this page"
     data-content-id="<%= content.id %>"