phpMyAdmin User if re-running ISPConfig Autoinstaller in case of failure

Currently ISPConfig Autoinstaller cannot resume from the last point of failure. Thus it is important that the installer can run multiple times until it completely succeeds. However, the SQL commands for phpMyAdmin will log two warnings as the database and the user exists. This is no blocker per se, but the "new" (current) password isn't correctly set for pma@localhost in follow-up runs while being changed in /usr/share/phpmyadmin/config.inc.php. This merge request fixes the described issue(s).

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