[BUGFIX] pi-singleselection should not depend on pidList

Change-Id: Ieabf0a952b1ce30ad27166ccca49655134cdb3de
Release: 2.3, 3.0
Resolves: #50596
Reviewed-on: http://review.typo3.org/31753
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>