[installer] master.cf changed on Debian 12 aka Bookworm

Summary

master.cf has changed on Debian 12 aka Bookworm. Thus the change of maildrop service in postfix master.cf does not work anymore.

Steps to reproduce

1. (Auto)Install ISPConfig on Debian 12 aka Bookworm
2. Check /etc/postfix/master.cf

maildrop  unix  -       n       n       -       -       pipe
  flags=DRXhu user=vmail argv=/usr/bin/maildrop -d ${recipient}

Correct behaviour

maildrop  unix  -       n       n       -       -       pipe
  flags=DRXhu user=vmail argv=/usr/bin/maildrop -d vmail ${extension} ${recipient} ${user} ${nexthop} ${sender}

Environment

Server OS + version: Debian 12
ISPConfig version: 3.2dev
Software version of the related software:

postfix 3.7.6-0+deb12u2

Proposed fix

Lines 1365-1367 in install/lib/installer_base.lib.php

			$content =	preg_replace('/flags=(DRX?hu) user=vmail argv=\/usr\/bin\/maildrop -d \${recipient}/',
						'flags=$1 user='.$cf['vmail_username'].' argv=/usr/bin/maildrop -d '.$cf['vmail_username'].' \${extension} \${recipient} \${user} \${nexthop} \${sender}',
						$content);