fix letsencrypt_renew_hook.sh syntax error

server/scripts/letsencrypt_renew_hook.sh

@@ -36,15 +36,15 @@ if [ -d "$lelive" ]; then
     pureftpdpem=/etc/ssl/private/pure-ftpd.pem; if [ -e "$pureftpdpem" ]; then chmod 600 $pureftpdpem; fi
     # For Red Hat, Centos or derivatives
     if which yum &> /dev/null 2>&1 ; then
-        if [ rpm -q pure-ftpd ]; then service pure-ftpd restart; fi
-        if [ rpm -q monit ]; then service monit restart; fi
-        if [ rpm -q postfix ]; then service postfix restart; fi
-        if [ rpm -q dovecot ]; then service dovecot restart; fi
-        if [ rpm -q mysql-server ]; then service mysqld restart; fi
-        if [ rpm -q mariadb-server ]; then service mariadb restart; fi
-        if [ rpm -q MariaDB-server ]; then service mysql restart; fi
-        if [ rpm -q nginx ]; then service nginx restart; fi
-        if [ rpm -q httpd ]; then service httpd restart; fi
+        if ( rpm -q pure-ftpd ); then service pure-ftpd restart; fi
+        if ( rpm -q monit ); then service monit restart; fi
+        if ( rpm -q postfix ); then service postfix restart; fi
+        if ( rpm -q dovecot ); then service dovecot restart; fi
+        if ( rpm -q mysql-server ); then service mysqld restart; fi
+        if ( rpm -q mariadb-server ); then service mariadb restart; fi
+        if ( rpm -q MariaDB-server ); then service mysql restart; fi
+        if ( rpm -q nginx ); then service nginx restart; fi
+        if ( rpm -q httpd ); then service httpd restart; fi
     # For Debian, Ubuntu or derivatives
     elif apt-get -v >/dev/null 2>&1 ; then
         if [ $(dpkg-query -W -f='${Status}' pure-ftpd-mysql 2>/dev/null | grep -c "ok installed") -eq 1 ]; then service pure-ftpd-mysql restart; fi