images: Don't remove journal machine log directory

This regressed in RHEL 10: https://issues.redhat.com/browse/RHEL-56025

images/scripts/lib/zero-disk.setup

@@ -46,7 +46,7 @@ rm -rf /var/tmp/*
 # try to not continue to write to /var for this setup boot
 # HACK: hangs forever in c8s due to https://bugzilla.redhat.com/show_bug.cgi?id=2174645
 timeout 10 journalctl --relinquish-var || true
-rm -rf /var/log/journal/*
+find /var/log/journal/ -type f -delete
 
 if [ $(findmnt / -n -o fstype) != "btrfs" ]; then
   dd if=/dev/zero of=/root/junk || true