BeginOcclusionTests called twice in ProfileGPU report during VRPreview

When running in VRPreview and entering the 'ProfileGPU' command, 'BeginOcclusionTests' is listed twice.

As the licensee mentioned, if a project uses heavy occlusion this could quickly become a costly resource.

1. Create new blank project.
2. With HMD plugged in, run VRPreview in default level.
3. Run the 'ProfileGPU' command.

Outcome The 'BeginOcclusionTests' is listed twice in the GPU profiler.

Expected The occlusion should only be called and listed once in the profiler's results.