[BUGFIX] Delete FAL records + relations in ResourceStorage::deleteFolder()

[BUGFIX] Delete FAL records + relations in ResourceStorage::deleteFolder()

When deleting a folder (recursive) also delete all FAL records and
relations to keep the FAL index up-to-date.

Resolves: #67084
Releases: master, 6.2
Change-Id: Ic3ae51a568ad43e6283e3900da24796656c9347c
Reviewed-on: http://review.typo3.org/39951
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Michael Oehlhof <typo3@oehlhof.de>
Tested-by: Michael Oehlhof <typo3@oehlhof.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>