Update the slider library to allow changing the value by
clicking somewhere on the slider and not only by
moving the button around.

Resolves: #70250
Releases: master
Change-Id: I96a61823015c2392699016e458f0dc8201615e6a
Reviewed-on: http://review.typo3.org/43685


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>