Backport OPENIDM-8275: new managed user boolean property not getting saved via Admin UI

Adding new properties to managed user schema do not get added to a managed user when saved via Admin UI.

Using sample2b with users already synced. Steps to reproduce via Admin UI:

• Configure > Managed Object > User;
• Create a new property, testBool, keeping all default options, save;
• Go to Manage > User
• Edit a user
• Set testBool from false to true
• Save
• Value is not saved

Setting property to Nullable has no impact on this behavior.