fix sorting of custom fields back url

app/controllers/custom_fields_controller.rb

@@ -71,7 +71,7 @@ class CustomFieldsController < ApplicationController
     if ok
       flash[:notice] = t(:notice_successful_update)
       call_hook(:controller_custom_fields_edit_after_save, custom_field: @custom_field)
-      redirect_to edit_custom_field_path(id: @custom_field.id)
+      redirect_back_or_default edit_custom_field_path(id: @custom_field.id)
     else
       render action: 'edit'
     end

app/views/custom_fields/_tab.html.erb

@@ -113,7 +113,7 @@ See doc/COPYRIGHT.rdoc for more details.
                 <td><%= checked_image custom_field.is_for_all? %></td>
                 <td><%= l(:label_x_projects, count: custom_field.projects.count) if custom_field.is_a? WorkPackageCustomField and !custom_field.is_for_all? %></td>
               <% end %>
-              <td><%= reorder_links('custom_field', {action: 'update', id: custom_field}, method: :put) %></td>
+              <td><%= reorder_links('custom_field', { action: 'update', id: custom_field, back_url: custom_fields_path }, method: :put) %></td>
               <td class="buttons">
                 <%= delete_link custom_field_path(custom_field) %>
               </td>