[TASK] Add main admin to system maintainers during first install

Resolves: #82439
Related: #82319
Releases: master
Change-Id: Ieabaf1e7a230ce82206ffea30efded9ba821d50f
Reviewed-on: https://review.typo3.org/54099


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Markus Sommer <markus.sommer@typo3.org>
Tested-by: Markus Sommer <markus.sommer@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>