[!!!][BUGFIX] Rename configuration for confirmation view

The configuration key for the confirmation layout has been renamed
from confirmation.layout to confirmationView.layout.

Resolves: #77344
Releases: 7.6
Change-Id: I6dad180d58143abd1da4a9930ca36cb0dbfbc9c7
Reviewed-on: https://review.typo3.org/49305


Reviewed-by: Bjoern Jacob <bjoern.jacob@tritum.de>
Tested-by: Bjoern Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Markus Hölzle <typo3@markus-hoelzle.de>
Tested-by: Markus Hölzle <typo3@markus-hoelzle.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>