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 670a12df)

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14002
16 jobs for bbaumbach-ci1 in 290 minutes and 38 seconds (queued for 5 seconds)
Status Name Job ID Coverage
  Build
passed build_ctdb #236077567
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passed build_samba #236175259
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passed build_samba_xc #236077560
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failed build_samba #236077571
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