Unsupported denoiser is selected in the Advanced Filtering settings

Jira twin of: https://fogbugz.unity3d.com/f/cases/1355226/

Steps to reproduce:

1. Download and open the attached project (OptixMacOSUIBug.zip)
2. Open SampleScene
3. Open Lighting window (Window > Rendering > Lighting)
4. Notice that Optix denoiser is selected despite not being supported on the platform

Notes:

• An info message is shown prompting users to switch to another denoiser
• Initiating a bake does not select a correct denoiser (which is OIDN in this case)
• Affects Optix and Radeon Pro denoisers on macOS

Suggestions:

• Move info box to the top of the Filtering field
• Do not duplicate info box
• Change info box text to "The current hardware or system configuration does not support the selected denoiser. Will use Open Image Denoiser instead."