[TASK] Set Sys log dateformat to system default

TYPO3 configuration knows a global date format configuration
within the installation tool. See TYPO3_CONF_VARS/SYS/ddmmyy

Use this global format as the default for Sys log

TYPO3_CONF_VARS/SYS/ddmmyy  is more efficient than
TYPO3_CONF_VARS/SYS/USdateFormat
ddmmyy ( Y-M-D | M-D-Y | D-M-Y)
USdateFormat ( M-D-Y | D-M-Y)

Releases: master, 10.4
Resolves: #91961
Change-Id: I06984ecda056511b1668b7bbd4dfa77b5333322c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65231


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>