[BUGFIX] Two png files should have filemode 664

Resolves: #60065
Releases: 6.2
Change-Id: I27917fed2a65f9810176b4afa716e8e752d7eff1
Reviewed-on: https://review.typo3.org/31294
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters