When validating LE certs, do not wait for a random time

While administering we will occasionally invoke this script interactively with the "non-interactive" switch still there, yet still sit at the desk waiting for 300 seconds for this timer to run out.

The systemd-timer already uses a 3h randomized delay for automatic renewals, which serves this purpose well.

roles/matrix-nginx-proxy/templates/usr-local-bin/matrix-ssl-lets-encrypt-certificates-renew.j2

@@ -27,4 +27,5 @@ docker run \
 		--standalone \
 		--preferred-challenges http \
 		--agree-tos \
-		--email={{ matrix_ssl_lets_encrypt_support_email }}
+		--email={{ matrix_ssl_lets_encrypt_support_email }} \
+		--no-random-sleep-on-renew