fix after_scim_response

Author: myang0

app/controllers/scim_rails/scim_service_controller.rb

@@ -3,7 +3,7 @@ class ScimServiceController < ScimRails::ApplicationController
     def configuration
       ScimRails.config.before_scim_response.call(request.params) unless ScimRails.config.before_scim_response.nil?
 
-      ScimRails.config.after_scim_response.call(users, "RETRIEVED") unless ScimRails.config.after_scim_response.nil?
+      ScimRails.config.after_scim_response.call(ScimRails.config.config_schema, "RETRIEVED") unless ScimRails.config.after_scim_response.nil?
 
       json_scim_response(object: nil)
     end