Ignore doubleSided parameter as it defaults to false

[sebastienblor]

In USD geometries the doubleSided parameter defaults to false, which is not a good default for Arnold rendering.
Not only this has a small cost at render time, but as soon as transmission is enabled this introduces incorrect results.

Since the Arnold parameter arnold:sidedness can be used to fine-tune it (with eventually different values per ray type), we could want to drop support for the builtin doubleSided attribute.

[autodesk-oss-arnold-bot]

Issue synced internally to ARNOLD-15464