[BUGFIX] viewhelper path fixed to new naming convention

changed back naming of frontend plugins for compatibility
of tt_content list_type

Change-Id: I16c92ac12c941e52d34e2807e7a3dff82c866180
Reviewed-on: https://review.typo3.org/25641
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind