Fix TruthResetAlg (ATLASSIM-6579)
Adding back in line removed by accident in !63033 (merged).
This prevented GenVertex objects created during the simulation step from being removed from the GenEvent by TruthResetAlg.
Should fix ATLASSIM-6579.
Adding back in line removed by accident in !63033 (merged).
This prevented GenVertex objects created during the simulation step from being removed from the GenEvent by TruthResetAlg.
Should fix ATLASSIM-6579.