[TASK] Remove tree rendering functionality in DB integrity tool

The functionality to render the integrity state as a tree of items
is disabled by default in TYPO3 CMS, and is now removed
without substitution.

Resolves: #68007
Releases: master
Change-Id: I12a85a157efa9171a82d4d6f3b9c0429a1ad7ab9
Reviewed-on: http://review.typo3.org/41038


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>