s4/torture: Remove already existing test_dir

s4/torture: Remove already existing test_dir

In configurations where vfs_acl_xattr is used with 'ignore system acls'
option we encounter NT_STATUS_ACCESS_DENIED while trying to open an
already existing test_dir in smb2.delete-on-close-perms.READONLY. Due
to missing SEC_STD_DELETE permission from the list of allowed ACEs it
couldn't be removed via previous call to smb2_deltree(). Thus as seen
with other tests we now call set_dir_delete_perms() so that subsequent
attempt to remove it can succeed.

Signed-off-by: Anoop C S <anoopcs@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Mon Jun 10 13:17:58 UTC 2024 on atb-devel-224