Skia: Fix colorized tile rendering

[ogoffart]

Regressed in 768c895

Fixes #9860

[ogoffart]

Note that I have no idea what i'm doing, I just found a function that could be converted to the right type in the canvas and my second attempt seems to work

[tronical]

Odd that this is now needed, but makes sense also to provide the Ganesh context. Could you check if this also works when using skia's software renderer (without recording context)?

[ogoffart]

Odd that this is now needed

Some kind of context was required before the update as well. The update removed it.
(Note that the "colorized" image have also effect applied to them so it make sense that this is a texture)

Could you check if this also works when using skia's software renderer

I confirm that winit-skia-software was not broken on my system and that this patch has no effect with it

[tronical]

Great :)