Remove unnecessary attr_accessor

app/services/application_settings/base_service.rb

 module ApplicationSettings
   class BaseService < ::BaseService
-    attr_accessor :application_setting, :current_user, :params
-
     def initialize(application_setting, user, params = {})
       @application_setting, @current_user, @params = application_setting, user, params.dup
     end

app/services/application_settings/update_service.rb

@@ -2,9 +2,9 @@ module ApplicationSettings
   class UpdateService < ApplicationSettings::BaseService
     def execute
       # Repository size limit comes as MB from the view
-      assign_repository_size_limit_as_bytes(application_setting)
+      assign_repository_size_limit_as_bytes(@application_setting)
 
-      application_setting.update(params)
+      @application_setting.update(@params)
     end
   end
 end