[FEATURE] Use mod dispatcher for filelist module

Use the backend module dispatcher for the
filelist extension.

Change-Id: I3b3ab0c485feabab0189cdb4b70d50c92464e41c
Resolves: #38103
Releases: 6.0
Reviewed-on: http://review.typo3.org/12110
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn