Fix systemd renewer to use sh

Author: tashian

systemd/cert-renewer@.service

@@ -22,7 +22,7 @@ ExecStart=/usr/bin/step ca renew --force ${CERT_LOCATION} ${KEY_LOCATION}
 
 ; Try to reload or restart the systemd service that relies on this cert-renewer
 ; If the relying service doesn't exist, forge ahead.
-ExecStartPost=/usr/bin/env bash -c "if ! systemctl --quiet is-enabled %i.service ; then exit 0; fi; systemctl try-reload-or-restart %i"
+ExecStartPost=/usr/bin/env sh -c "! systemctl --quiet is-enabled %i.service || systemctl try-reload-or-restart %i"
 
 [Install]
 WantedBy=multi-user.target