message: remove Geant4 magField Nystrom setting Jira
diff: @@ -500,7 +500,8 @@ void Config()
  geant4->ProcessGeantCommand("/process/optical/processActivation OpWLS 0");
  geant4->ProcessGeantCommand("/process/optical/processActivation OpMieHG 0");
  geant4->ProcessGeantCommand("/process/optical/setTrackSecondariesFirst Cerenkov 0");
  - geant4->ProcessGeantCommand("/mcMagField/stepperType NystromRK4");
  + // Not working, comment for the moment, adds shift in phi and tail to shower shape (which is good ...)
  + //geant4->ProcessGeantCommand("/mcMagField/stepperType NystromRK4");
  if(iTRD)
  {
  