Fix RecordNotFound message format assertion for Rails 7.2

Rails 7.2 quotes String id values in ActiveRecord::RecordNotFound's message
(e.g. 'id'="60" instead of 'id'=60). Update the expected flash message
accordingly in test_should_delete_allowed_user.

Author: tungleduyxyz

test/functional/kaui/admin_allowed_users_controller_test.rb

@@ -134,7 +134,9 @@ class AdminAllowedUsersControllerTest < Kaui::FunctionalTestHelper
 
       # should respond with an error if tried to delete again
       delete :destroy, params: { id: }
-      assert_equal "Error: Couldn't find Kaui::AllowedUser with 'id'=#{id}", flash[:error]
+      # Rails 7.2 quotes the id value in ActiveRecord::RecordNotFound's message
+      # (e.g. 'id'="60" instead of 'id'=60), since the id here is a String.
+      assert_equal "Error: Couldn't find Kaui::AllowedUser with 'id'=\"#{id}\"", flash[:error]
       assert_response :redirect
       # validate redirect path
       assert response_path.include?('/kaui/home'), "#{response_path} is expected to contain '/kaui/home'"

test/functional/kaui/functional_test_helper_nosetup.rb

@@ -16,7 +16,7 @@ class FunctionalTestHelperNoSetup < ActionController::TestCase
     # body gets parsed as multipart. Clear it before every request; #process re-sets it as
     # needed for whichever request is actually being made.
     def process(*, **)
-      @request.delete_header('CONTENT_TYPE') if @request
+      @request&.delete_header('CONTENT_TYPE')
       super
     end