python/ntacls: use correct "state directory" smb.conf option instead of "state dir"

python/ntacls: use correct "state directory" smb.conf option instead of "state dir"

samba-tool ntacl get testfile --xattr-backend=tdb --use-ntvfs
Fixes: Unknown parameter encountered: "state dir"
Signed-off-by: Björn Baumbach <bb@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
(cherry picked from commit 670a12df52df63a067b638d37bec71341bf18bdd)

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14002

Autobuild-User(v4-10-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-10-test): Wed Jun 26 11:37:29 UTC 2019 on sn-devel-144