Cleanup of McParticleEvent before migration to HepMC3

Andrii Verbytskyirequested to merge
averbyts/athena:hepmc3_PhysicsAnalysis_TruthParticleID_McParticleEvent_ into master

In this MR:

  • Cleanup of McParticleEvent (test) before migration to HepMC3

The changes are only cosmetics.

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