[CLEANUP] Remove scheduler option for extended description

There is an always activated option
to show a description for tasks on hover.

This option is removed, the feature is
always turned on.

Releases: master
Resolves: #62663
Change-Id: I6f3b656fb9f4721dcd23982eda31f63309bb35ed
Reviewed-on: http://review.typo3.org/33761
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>