Broken by cf92af3ac4
The `thin_film_bsdf` node no longer exists in the version of MaterialX
that we use. It's been removed in favor of specifying the thin-film
values directly on the `dielectric_bsdf`, `conductor_bsdf`, or
`generalized_schlick_bsdf` nodes.
There is another use of the node inside the Principled BSDF's `BSDF`
output case. The `Surface` case is correct but the BSDF layering setup
still needs addressed. This PR will get the tests passing though.
Pull Request: https://projects.blender.org/blender/blender/pulls/141974
a8668ddbd5