fix: ensure filter is also an acceptable size

[wash2]

Rendering currently panics for SVGs with extremely large filters, like https://github.com/Davidoc26/wallpaper-selector/blob/main/data/icons/io.github.davidoc26.wallpaper_selector.svg.

I am not terribly familiar with this project, but it seems that while the layer will be shrunk if it is too large, the filters are left unchanged, which eventually causes a source / dest size mismatch and panics when they are asserted to be the same. This change shrinks the filter via the transform as well, if necessary, which resolves the issue when I test it and matches the correct rendering.

[LaurenzV]

Sorry for the lack of response, I'll try to take a closer look soon.

[wash2]

Thanks!