[BUGFIX] Remove references to extListArray

Fixes: #52849
Releases: 6.2
Change-Id: I1308ffec460b7d4a61456564721206c7e99d5a99
Reviewed-on: https://review.typo3.org/24795
Reviewed-by: Wouter Wolters
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Thomas Maroschik
Tested-by: Thomas Maroschik