[BUGFIX] Call `f:count()` in Site Settings overview correctly

Resolves: #104939
Related: #104913
Releases: main
Change-Id: Ie3486041db6ffe31c10da32c5e281cbb6b2d0017
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/86048


Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: Benjamin Franzke <ben@bnf.dev>