s4:smbtorture: Fix samba3.smb.dir on btrfs

s4:smbtorture: Fix samba3.smb.dir on btrfs

"If a file is removed from or added to the directory after the most recent call
to opendir() or rewinddir(), whether a subsequent call to readdir() returns
an entry for that file is unspecified."
https://pubs.opengroup.org/onlinepubs/009604599/functions/readdir.html

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Fri Nov 29 15:10:13 UTC 2024 on atb-devel-224