[TASK] Change order of preferred extension icons

Prefer svg over png icons.

Resolves: #81396
Releases: master, 8.7
Change-Id: Ide44eb1f0c841c788516424fbff01bd319c79104
Reviewed-on: https://review.typo3.org/53002


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christer V <cvi@systime.dk>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>