[BUGFIX] Don't use FAL based ImageViewHelper in extension manager

Resolves: #68636
Releases: master, 6.2
Change-Id: I15c48447d0226518f0bdf8459295a82e49864306
Reviewed-on: http://review.typo3.org/42119


Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>