Set @body_classes to admin layout (#9081)

app/controllers/settings/two_factor_authentication/confirmations_controller.rb

@@ -7,6 +7,7 @@ module Settings
 
       before_action :authenticate_user!
       before_action :ensure_otp_secret
+      before_action :set_body_classes
 
       def new
         prepare_two_factor_form
@@ -43,6 +44,10 @@ module Settings
       def ensure_otp_secret
         redirect_to settings_two_factor_authentication_path unless current_user.otp_secret
       end
+
+      def set_body_classes
+        @body_classes = 'admin'
+      end
     end
   end
 end