[BUGFIX] Add missing parameters to getFiles

InaccessibleFolder extends Folder and the definition of its methods 
should therefor be compatible to each other.

Resolves: #73712
Releases: master, 7.6

Change-Id: I3798841a7349ac7b615238328c26d540cf938d34
Reviewed-on: https://review.typo3.org/47291


Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>