Fix public_r_tag selection

app/controllers/admin/page_parts_controller.rb

@@ -126,7 +126,8 @@ class Admin::PagePartsController < ApplicationController
   end
 
   def reload_r_tag_options
-    @r_tag = (ModuleApp.find(params[:id]) rescue nil) || params[:id]
+    @part = PagePart.find params[:id]
+    @r_tag = params[:type]
     @tag_objects = @r_tag.classify.constantize.all rescue nil
     respond_to do |format|
       format.js  {}