Fix mismatch between USD and Hydra for GI_transmission_depth #2288
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Changes proposed in this pull request
In USD we were forcing some default values for GI_diffuse_depth and GI_specular_depth, but not for GI_transmission_depth.
Here I'm setting it to 8 by default, as it's set in all the arnold plugins (the core defaults to 2).
I'm also forcing it to be set in the usd writer as for the other 2 attributes
Issues fixed in this pull request
Fixes #2287