Fix tessellated solid

[SeverinDiederichs]

This PR fixes a nasty little bug in the conversion of the tessellated solid:

The VecGeom function AddTriangularFacet differs from the G4TriangularFacet:
In the VecGeom function, the final argument is a simple boolean:

 bool AddTriangularFacet(Vector3D<Precision> const &vt0, Vector3D<Precision> const &vt1,
                          Vector3D<Precision> const &vt2, bool absolute = true)

passing the Geant4 enum ABSOLUTE evaluates to 0:

enum G4FacetVertexType { ABSOLUTE, RELATIVE };

so in this case, it was always set to absolute = false, leading to a bug.

A unit test with a ray is added to make sure the result is as expected.

[sethrj]

Excellent! Thanks for the fix and test.

[SeverinDiederichs]

Thank you for the quick merge @sethrj. Would it be possible to stamp a new version with the fix in? Then we can update AdePT / Celeritas to pull the latest version including the fix :)
Thanks!