Bug#1088076: galera-arbitrator-4: The -w/WORK_DIR feature doesn't work because of a missing comma in the configuration code

[Adel Belhouane]

Because of the upstream nature, this bug applies to all galera-arbitrator-4
versions: for bullseye, bookworm, trixie/sid. If you'd prefer a M.R, I would
need some directions to know to what branch to submit this M.R.

regards,
Adel Belhouane.