Wrong class variable in server/lib/classes/db_mysql.inc.php LINE 275

short description

Multi-Server environment should connect to master server but spelling mistake in server/lib/classes/db_mysql.inc.php LINE 275 forbid this and cron.log fills with warnings.

correct behaviour

$this->isConnId should be $this->iConnId

environment

Server OS: Debian 10

Server OS version: buster

ISPConfig version: 3.1.15p1