test: change from CPU to GPU SEvt

[plexoos]

No description provided.

[plexoos]

This change triggers a runtime error:

simg4ox: /esi/opticks/sysrap/SEvt.cc:2182: void SEvt::hostside_running_resize(): Assertion `is_self_provider' failed.
2025-01-15 00:49:26.695 FATAL [380] [SEvt::hostside_running_resize@2175]  NOT-is_self_provider SEvt::descProvider provider.getTypeName QEvent that address is: another object
/__w/_temp/282a72ae-71d4-4728-9193-70d2b0b58e2f.sh: line 3:   380 Aborted                 (core dumped) build/src/simg4ox -g geom/raindrop.gdml -m run.mac
Error: Process completed with exit code 134.

[ggalgoczi]

Getting error for the same thing for TorchTest. See #89

However this change works for GenSteps.

We need to change per Simon: https://groups.io/g/opticks/topic/sgenerate_with_torch_rtx_on/109912833

Note that SGenerate.h exists to enable comparisons between Opticks
and Geant4 by providing a way of giving some types of
Opticks gensteps to Geant4.

Because of this comparison there are two SEvt instances
to be aware of (with enum EGPU:0 and ECPU:1).

Opticks mostly follows the convention that static method names
are capitalized. Your method AddOpticksHits
looks to be confusing the EGPU and ECPU SEvt instances
and being unaware that you are using static methods.::

    SEvt *sev = SEvt::Get_ECPU();
    unsigned int num_hits = sev->GetNumHit(0);
                            ^^^^^^^^^^^^^^^^^
                 static method : returning EGPU hits despite sev being ECPU event

    unsigned num_hits_gpu = SEvt::GetNumHit(EGPU);
    unsigned num_hits_cpu = SEvt::GetNumHit(ECPU);

It's better to use the _ECPU() _EGPU() methods or the enum to be
clearer.

[plexoos]

Actually, Simon’s comment makes sense. However, I don’t think we want to run Opticks simulations on the CPU or let Geant4 execute them at this point. If we can get hits from EGPU SEvt, that should suffice.