[unity] SkeletonGraphicRenderTexture example component RenderTexture distorted

[HaraldCsaszar]

Reported on the forum:
https://esotericsoftware.com/forum/d/26082-skeletongraphicrendertexture-deformed-output-in-sample-scene
In some verions of Unity the custom set RawImage Mesh vertices and uv coords are ignored, leading to 0-1 coords being used instead, displaying the correctly filled RenderTexture in a distorted way.