[BUGFIX] Don't import PHP class in ext_localconf.php

Resolves: #89970
Releases: master
Change-Id: I5b7e22c853993e7434c086c22a3898eefbe07899
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62687


Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Jan Stockfisch <typo3@jan-stockfisch.de>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Jan Stockfisch <typo3@jan-stockfisch.de>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>