Tests: Add one more webp test file

It's a simple lossless file from:
https://developers.google.com/speed/webp/gallery2#webp_links

> "baby tux for my user page"
> Image Author: Fizyplankton
> This file is in the public domain.
This commit is contained in:
Nico Weber 2023-02-25 18:36:32 -05:00 committed by Andreas Kling
parent ce500ed170
commit 889a02f9df

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