This resolves two issues:
1. On macOS the GPU Compute device would be disabled by default unless
the user opens user preferences. This is unexpected behaviour ever
since 09ba1486f8
2. Fixes incorrect automatic denoiser display settings and errors in
terminal related to the denoising UI on macOS if the user hasn't opened
user preferences.
Pull Request: https://projects.blender.org/blender/blender/pulls/123911
f3fb3a9ecd