Draft: Fix compilation errors
This MR fixes 2 compilation errors (one in FullSimLight and the other one in one of the examples) due to the interface change GeoPhysVol vs GeoVPhysVol.
This MR fixes 2 compilation errors (one in FullSimLight and the other one in one of the examples) due to the interface change GeoPhysVol vs GeoVPhysVol.