[BUGFIX] Extend Lowlevel lost_files to accept customPath

This allows the lowlevel lost_files cleaner to use
customPaths as input too.

Resolves: #72202
Releases: master,8.7
Change-Id: I1481d036c8c337eee54a97d8a192d6a39a6af404
Reviewed-on: https://review.typo3.org/45238


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Stefan Rotsch <stefan.rotsch@aoe.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Reviewed-by: Henning Liebe <h.liebe@neusta.de>
Tested-by: Henning Liebe <h.liebe@neusta.de>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>