Fix new user confirmation page styling

app/controllers/auth/setup_controller.rb

@@ -3,6 +3,7 @@
 class Auth::SetupController < ApplicationController
   layout 'auth'
 
+  before_action :set_pack
   before_action :authenticate_user!
   before_action :require_unconfirmed_or_pending!
   before_action :set_body_classes
@@ -55,4 +56,8 @@ class Auth::SetupController < ApplicationController
   def missing_email?
     truthy_param?(:missing_email)
   end
+
+  def set_pack
+    use_pack 'auth'
+  end
 end