Wrong extraction of dlh5 muon files

In the muon_extractor from offlineh5 files to dlh5 files, the energy is calculated wrong. https://git.km3net.de/ml/OrcaSong/-/blob/master/orcasong/extractors/neutrino_chain.py#L532-537 Right now the energy is calculated as the sum of energy entries for the blob. This is made of the rimary and all secondaries. To only count the primary, a check for minimum number of hits is used. This however also effect some primaries. Better would be: energy = blob["McTracks"].energy[0]