Fix AD example

For Active Directory we need: OCIS_LDAP_DISABLE_USER_MECHANISM=none.
Until we add support for evaluating the "userAccountControl" bitmask, we
don't supported display the account enable/disable state for Active
Directory users.
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f