[BUGFIX] Make edit button in FormEngine wizard work again

When clicking on the edit button wizard in FormEngine
(e.g. when editing a be_group inside the be_user record)
then there is a JS error preventing from opening a popup.

Resolves: #65415
Relates: #63846
Releases: master
Change-Id: Iafac6759054d0e2ce229b34b17b6a5312e1408df
Reviewed-on: http://review.typo3.org/37359


Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Frank Nägler <typo3@naegler.net>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>