[FOLLOWUP][TASK] Replace PNG module icons with SVG icons

Remove usage of removed PNG.

Resolves: #68090
Releases: master
Change-Id: Ie44f5d436d0e20620fb15cb6df85a7a27985412c
Reviewed-on: http://review.typo3.org/41165


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: Frank Nägler <frank.naegler@typo3.org>