s4:auth: encrypt_user_info() should set password_state instead of mapped_state

s4:auth: encrypt_user_info() should set password_state instead of mapped_state

user_info->mapped_state has nothing to do with enum auth_password_state,
user_info->password_state is the one that holds the auth_password_state value.

Luckily user_info->password_state was never referenced in the
encrypt_user_info() callers.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13879

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
(cherry picked from commit a6fb598d9dcbfe21ef285b5f30fabcb88a259c93)