52fcbe4cd6
The previous version listed four unit paths separated by `\` + newline.
That looks fine in source but YAML plain-scalar folding collapses the
sequence to a literal `\ ` — the backslash + space no longer functions
as a shell line continuation, and only the first path actually gets
passed to rm. End result on esh-docker-vm's first run: backup.service
removed; backup.timer + prune.service + prune.timer survived; verify
correctly caught the partial state.
Switched to `rm -f /etc/systemd/system/autorestic-*.{service,timer}`
form — single string, no folding hazard, and idempotent on hosts where
some or all of the files are already gone. Re-running on esh-docker-vm
will mop up the leftovers cleanly.