add backend form append note and fix show image

app/controllers/panel/announcement/back_end/bulletins_controller.rb

@@ -141,6 +141,8 @@ class Panel::Announcement::BackEnd::BulletinsController < OrbitBackendController
 
       params[:bulletin][:email_user_ids] = params[:bulletin][:email_user_ids].uniq
       params[:bulletin][:email_user_ids].delete('')
+
+      params[:bulletin][:update_user_id] = current_user.id
       
       delete_out_invalid_date_from_params
       respond_to do |format|