Remove code argument from send_two_factor_authentication_code

lib/two_factor_authentication/hooks/two_factor_authenticatable.rb

@@ -1,8 +1,7 @@
 Warden::Manager.after_authentication do |user, auth, options|
   if user.respond_to?(:need_two_factor_authentication?)
     if auth.session(options[:scope])[:need_two_factor_authentication] = user.need_two_factor_authentication?(auth.request)
-      code = user.otp_code
-      user.send_two_factor_authentication_code(code)
+      user.send_two_factor_authentication_code
     end
   end
 end