Use Let's Encrypt as CA if BuyPass isn't used

Since acme.sh now uses ZeroSSL as default CA for new certs

generate-acme.sh

@@ -79,6 +79,10 @@ fi
 # Make sure we point to the right CA.
 if [[ $BUYPASS -eq 1 ]]; then
     ACME_PARAMS+=" --server https://api.buypass.com/acme/directory"
+else
+    # For some reason acme.sh is now using ZeroSSL as the default CA for new certs.
+    # I hate change, so we force Let's Encrypt unless BuyPass is used.
+    ACME_PARAMS+=" --server letsencrypt"
 fi
 
 echo "${ECHO_PREFIX} Reload command? For example: nginx -s reload"