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McParticleTools: Fix copying of beam particles for HepMC2.

Scott Snyder requested to merge ssnyder/athena:beam.McParticleTools-20220418 into master

In HepMC2, we were failing to copy the beam particle pointers from HepMC::GenEvent. This would seem to naturally go in HepMC::copyemptyGenEvent --- but it can't actually go there because the beam particles must have first been added to the event.

See ATLASRECTS-6859.

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