fix systemd-run tests (#1730)
fix systemd-run tests (#1730)

Fixes a typo preventing `systemd-run` with `--on-calendar` from working.

Co-authored-by: Carrie Roberts <9e9095607825afde3c102e8bff2cbec60876d766@gmail.com>
redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team,redcanaryco/atomic-red-team