[BUGFIX] Repair depth selection in workspace module

This patch fixes a regression introduced with
https://review.typo3.org/#/c/Packages/TYPO3.CMS/+/60492/

Resolves: #43338
Releases: master, 9.5
Change-Id: I3ac8445ec21097531ff1dcb5e33d0ff271332be3
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/60495


Tested-by: Benni Mack <benni@typo3.org>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Daniel Sattler <sattler@b13.de>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Daniel Sattler <sattler@b13.de>
Reviewed-by: Achim Fritz <af@achimfritz.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>