s3:tests: Reformat test_forceuser_validusers.sh

shfmt -f source3/script/| xargs shfmt -w -p -i 0 -fn

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Thu May  5 11:53:51 UTC 2022 on sn-devel-184
