[Watchdog] Revert acme-mailcow threshold to 1

data/Dockerfiles/watchdog/watchdog.sh

@@ -465,7 +465,7 @@ fail2ban_checks() {
 acme_checks() {
   err_count=0
   diff_c=0
-  THRESHOLD=2
+  THRESHOLD=1
   ACME_LOG_STATUS=$(redis-cli -h redis GET ACME_FAIL_TIME)
   if [[ -z "${ACME_LOG_STATUS}" ]]; then
     redis-cli -h redis SET ACME_FAIL_TIME 0