fixed typo from last commit

server/plugins-available/nginx_plugin.inc.php

@@ -1337,7 +1337,7 @@ class nginx_plugin {
 				$success = false;
 				$letsencrypt = explode("\n", shell_exec('which letsencrypt certbot /root/.local/share/letsencrypt/bin/letsencrypt'));
 				$letsencrypt = reset($letsencrypt);
-				if(is_executable($letsencrypt) && && !empty($lddomain)) {
+				if(is_executable($letsencrypt) && !empty($lddomain)) {
 					$success = $this->_exec($letsencrypt . " certonly -n --text --agree-tos --expand --authenticator webroot --server https://acme-v01.api.letsencrypt.org/directory --rsa-key-size 4096 --email postmaster@$domain $lddomain --webroot-path /usr/local/ispconfig/interface/acme");
 				}
 				if(!$success) {