[BUGFIX] Install Tool does not save Extbase object cache Configuration

Change-Id: I1ee28a5af824b048863c61321a226bf7c9843f77
Resolves: #55556
Releases: 6.2
Reviewed-on: https://review.typo3.org/28175
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters