set default desc sort for faqs api

app/controllers/admins/faqs_controller.rb

@@ -2,7 +2,7 @@ class Admins::FaqsController < Admins::BaseController
   before_action :find_faq, only: [:edit,:update, :destroy]
 
   def index
-    sort_by = params[:sort_by] ||= 'created_at'
+    sort_by = params[:sort_by] ||= 'updated_at'
     sort_direction = params[:sort_direction] ||= 'desc'
 
     keyword = params[:keyword].to_s.strip

app/controllers/helps/faqs_controller.rb

@@ -2,7 +2,7 @@ class Helps::FaqsController < ApplicationController
   skip_before_action :check_sign, :user_setup
 
   def index
-    faqs = Faq.select_without_id
+    faqs = Faq.select_without_id.order(updated_at: :desc)
     render json: faqs.as_json(:except => [:id])
   end
 end