[BUGFIX] Fix backend tree height

This patch set the height for the backend trees (page and filelist) to 100%.

Resolves: #78307
Releases: master
Change-Id: I49c1ae84ed263b185047761b6f009a6362f52b9f
Reviewed-on: https://review.typo3.org/50243


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Riccardo De Contardi <erredeco@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>