Hand matting option sometimes doesn't follow toggle box when launching VR, after app was backgrounded at least once

[shinyquagsire23]

Sometimes the app doesn't fully clean up and seems to reuse the existing immersive scene, with incorrect settings? Or something, I'm not sure what it's doing.

[shinyquagsire23]

This might actually be a visionOS bug because I just had it change mid-session after opening Control Center, lol

[shadowfacts]

Actually, I think I missed this in my PR review. Here, the GlobalSettings instance should be in an @ObservedObject in the app struct, so that SwiftUI tracks the dependency properly: https://github.com/alvr-org/alvr-visionos/blob/main/ALVRClient/ALVRClientApp.swift#L77

Or GlobalSettings could use @Observable, in which case the dependency would be picked up without needing the additional property wrapper.