Remove unneeded controller option in routes (#30958)

config/routes.rb

@@ -98,7 +98,7 @@ Rails.application.routes.draw do
 
     namespace :auth do
       resource :setup, only: [:show, :update], controller: :setup
-      resource :challenge, only: [:create], controller: :challenges
+      resource :challenge, only: [:create]
       get 'sessions/security_key_options', to: 'sessions#webauthn_options'
       post 'captcha_confirmation', to: 'confirmations#confirm_captcha', as: :captcha_confirmation
     end