Fix test failures due to custom_fields deletion leaving orphaned custom_values in IssueNestedSetConcurrencyTest (#41881).

Patch by Kenta Kumojima (user:kumojima).


git-svn-id: https://svn.redmine.org/redmine/trunk@23319 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/issue_nested_set_concurrency_test.rb

@@ -36,7 +36,7 @@ class IssueNestedSetConcurrencyTest < ActiveSupport::TestCase
       ActiveRecord::Base.establish_connection connection
     end
     User.current = nil
-    CustomField.delete_all
+    CustomField.destroy_all
   end
 
   def teardown