[TASK] Follow-up: Replace config.persistence.classes typoscript

With #87623, a couple of fixture classes have been added to the
Classes folder instead of the Tests folder. With this patch the
fixture classes are moved to their proper location.

Releases: master
Resolves: #88607
Relates: #87623
Change-Id: Ib90f3c7e628270bd5bb16a7d95c1df5cf5fe8e9a
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/61113


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Benni Mack <benni@typo3.org>