[TASK] Remove unnecessary typecasts in ext:recycler

Function argument types of the `resolveTree` function in
the `DeleteRecords` class already use strict types, so the
following typecasts can safely be removed.

Resolves: #103506
Releases: main
Change-Id: I332a2eabdc3727749ff25fbfeee476d0a6b6b39b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83627


Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: core-ci <typo3@b13.com>