Fix domain in pngdumper.

Task-number: QTBUG-32390
Change-Id: Ia511663070b75fae7a2bef1ef16c12ac415facc6
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: I90a1f360da098f92db19685a2d6b4caddf6f35e8