MSVC 2022 compiler fixes + minor correction for older Hydra APIs

[boberfly]

Hi, I just have some small fixes when compiling with MSVC 2022 and targetting an older Hydra API (USD 23.02).

First commit has the compiler fixes (changing operator notation and to && and not to !) and the second commit has the comma fix for old hydra APIs.

I used these fixes for release/v0.29.0 but I thought I'd target the dev branch for upstreaming.

Cheers