[BUGFIX] impexp has to use module dispatcher

Resolves: #57873
Releases: 6.2
Change-Id: I6f622c32429143bd55ffe9286a26a920d791ea5b
Reviewed-on: https://review.typo3.org/29443
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind