Apple: Correct re-declaration of structs as classes

[dgovil]

Description of Change(s)

This change fixes two areas where something was defined a structure, but was referenced as a class elsewhere. While this is harmless, it does cause some spurious compile time warnings.

I'm trying to reduce the number of warnings I get when building USD (which is a lot) to make it less noisy when developing on the USD codebase. So I'll put up PRs as I have downtime.

This is low priority and low/no impact to the codebase, but the reduced compile time noise is a win.

Fixes Issue(s)

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• [X] I have verified that all unit tests pass with the proposed changes
• [X] I have submitted a signed Contributor License Agreement

[jesschimein]

Filed as internal issue #USD-10190

[jesschimein]

/AzurePipelines run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).

[nvmkuruc]

Thanks @dgovil. 👍