Export favicon image as PNG-24.
Export favicon image as PNG-24.

* Should make the icon look a lot better on dark backgrounds.

Signed-off-by: aixxe <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@aixxe.net>
(cherry picked from commit d6cc7e451f71a18849421bd1e39db2018d99a063)

aixxe/kayo,aixxe/kayo,aixxe/kayo