[BUGFIX] Ignore cache configuration options when loading Install tool

The options of cacheConfigurations were not reset when setting the
cacheConfigurations to NullBackend in the Install tool.

Resolves: #55527
Releases: 6.2
Change-Id: I25586f16f001fdddbd2d43b2df9110f65c4ad1b4
Reviewed-on: https://review.typo3.org/27214
Reviewed-by: Ernesto Baschny
Reviewed-by: Peter Kuehn
Tested-by: Peter Kuehn
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn