Use dispatching for show_item.php

Resolves: #65283
Releases: master
Change-Id: If70f513ecc50445ea67b7e68bf7cd1df44cbf013
Reviewed-on: http://review.typo3.org/37186


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>