Show MetalFX options in the Scaling 3D Mode enum on all platforms
Previously, the MetalFX scaling modes were only displayed in the
`macos` and `ios` feature tag overrides if the editor had Metal support
enabled. However, this is only available on the macOS editor, which caused
two issues:
- You couldn't set the 3D scaling mode to MetalFX for `macos` or `ios`
if you were using the editor on another platform.
- If you opened a project that was last edited on macOS with MetalFX scaling
modes set for these overrides, it would show an unknown value or revert
to the default when saving to the project (as the enum value didn't exist
anymore on your end).