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
24 jobs for bbaumbach-fix-14002_v4-10 in 424 minutes and 34 seconds (queued for 4 seconds)
latest
Status Name Job ID Coverage
  Build
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passed build_samba_libs #234836000
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passed build_samba_xc #234835993
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canceled build_samba #234836008
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failed build_samba_py2 #234836009
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