[BUGFIX] Prevent endless loop in recycler folder detection

Compare folder identifiers instead of folder objects because
objects pointing to the same folder might still be different
object instances.

Change-Id: I78e21b9e68fbaae245d12ac4efb96312b246a847
Releases: master, 8.7
Resolves: #85019
Reviewed-on: https://review.typo3.org/56985


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Frans Saris <franssaris@gmail.com>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>