[BUGFIX] Make Recycler Scheduler Task work in Windows and with FAL

The recycler scheduler task was previously configured to only
use "fileadmin/_recycler_/", and did not work on windows, as
"ctime" was used to detect the last change to the file.

It is now switched to "mtime" - which is updated every time
a file or folder is moved to a recycler folder.

Resolves: #77040
Releases: master
Change-Id: I06df5cb614457261c661c8fac09581af9f3bf256
Reviewed-on: https://review.typo3.org/48910


Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>