retrain on new 20240625_all_2M_merged ntuples

[jpata]

Retrain on new ntuples with the old setup (train on ZH).

This training contains the following updates over the previous run at https://github.com/HEP-KBFI/ml-tau-en-reg/pull/30:

• PFcandidates in jets are now sorted by pt-descending #45
• decay mode minor fix for photons #41
• updated Z statistics to ~2M events, updated ntuple merging #43

Overall everything looks reasonable.