[BUGFIX] Edit wizard is working again

When editing a backend user and selecting a backend user group in the
select box, pressing the edit wizard icon resulted in the message:
"Please select one or more items in the list before you can edit."

With this patch the popup with the edit backend user group form appears.

Resolves: #70817
Releases: master
Change-Id: I55ddd790ecda9b23f9bb718a037d99112cf10e1a
Reviewed-on: http://review.typo3.org/44133


Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>