[BUGFIX] Properly show indeterminate state of categories

Prepared nodes were not properly handled in the category
element, causing the  indetermination state recalculation to
never trigger properly. Using the nodes from the
nodes-prepared event fixes this issue.

Resolves: #98689
Releases: main, 12.4, 11.5
Change-Id: I63f9618c596cdad343d4af8393120eabae3fdbd4
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/79688


Reviewed-by: Andreas Nedbal <andy@pixelde.su>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Nedbal <andy@pixelde.su>