[TASK] Drop usage of SkinImageViewHelper in ext:about

Resolves: #68139
Releases: master
Change-Id: I468fc51a9221261b7fc2dfa02701efa4dbaf0892
Reviewed-on: http://review.typo3.org/41235


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>