Substrate SSR reflections are black

Substrate Materials do not use Screen-Space reflections. Instead, they do not have any reflections (indirect specular) on the surface.

1. Download the Licensee's test project and open (see addl info URL)
2. Focus on the actor "EditorSphere"
3. Observe that it is pitch black, with a specular highlight and does not reflect the environment.
4. Open its Material "/Game/Reflection"
5. Observe that it is a shiny chrome Material.
6. Add a PostProcessVolume, make it Unbound, and set the reflection method to "Lumen"
7. Observe that the "EditorSphere" now reflects the environment
8. Set the reflection method in the PostProcessVolume to "Screen Space"
9. Observe that the "EditorSphere" returns to its black state