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TruthSelectionTtres Fix 1e5 ->1e6 bug

Philip Clark requested to merge pclark/athena:23.0-TruthSelectionTtres-Fix1e5Bug into 23.0

There was a hardcoded number 100000 instead of 1000000, we think this was to suppress all regenerated Geant4 particles, i.e. secondaries. However, please check if it should be all Geant 4 particles then it should use 200000.

We've also used HepMC::SIM_REGENERATION_INCREMENT if you want 200000 then HepMC::SIM_BARCODE_THRESHOLD should be used.

@averbyts @jchapman

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