Fix invalid/expired invites being processed on sign-up (#24337)

app/controllers/auth/registrations_controller.rb

@@ -48,7 +48,7 @@ class Auth::RegistrationsController < Devise::RegistrationsController
     super(hash)
 
     resource.locale                 = I18n.locale
-    resource.invite_code            = params[:invite_code] if resource.invite_code.blank?
+    resource.invite_code            = @invite&.code if resource.invite_code.blank?
     resource.registration_form_time = session[:registration_form_time]
     resource.sign_up_ip             = request.remote_ip