[TASK] Fix a few variable names

Fix a few typo in the variable names.

Change-Id: I334e31a1e8e37ce7a79a3b905758843d51463c26
Releases: 6.2
Resolves: #56165
Reviewed-on: https://review.typo3.org/27762
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters