[BUGFIX] Fix linkvalidator level

Fix a problem in the GUI where the previous page "depth" selector
("Show this level") was not remembered when selecting a different
page in the page tree.

Resolves: #95893
Releases: master
Change-Id: Ifdb90ac21701dd9ad2a87a1864f24d32e6dd1f8f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72197


Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>