[BUGFIX] Fix new content element wizard links click area

This formats the links within the new content element wizard as
inline-block, thus ensuring the whole link area is clickable.

Resolves: #56063
Releases: master, 6.2
Change-Id: Id5d7e080787d434a89220ce361fb3cf3d911029e
Reviewed-on: http://review.typo3.org/35461
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>