[BUGFIX] Fix CSH on Info -> Pagetree overview

Fixes undefined variable.

Releases: master
Resolves: #79586
Change-Id: I9873775cabfd274c03353b1022f325ee2636269f
Reviewed-on: https://review.typo3.org/51503


Reviewed-by: Thomas Hohn <thomas@hohn.dk>
Tested-by: TYPO3com <no-reply@typo3.com>
Tested-by: Riccardo De Contardi <erredeco@gmail.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>