Update rake for resetting position

Fix codemirror css

lib/tasks/new_ui.rake

@@ -91,8 +91,10 @@ namespace :new_ui do
     end
   end
 
-  task :save_users => :environment do
-    User.not_guest_user.where(position: nil).each(&:save)
+  task :reset_user_position => :environment do
+    User.not_guest_user.each_with_index do |user, i|
+      user.update_attribute(:position, i)
+    end
   end
 
 end