[BUGFIX] Allow recursive folder deletion

Remove the useless check for the number of existing
files in the ExtendedFileUtility.
We now let FAL try to delete recursively by default.
It will tell us, if the permissions do not suffice
for the current user.

Resolves: #63580
Releases: master, 6.2
Change-Id: Iec7ab95d493ce3594a4131b45e5bcb77de9e21b6
Reviewed-on: http://review.typo3.org/35317
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>