Draft: Hot fix NN models before data taking a

Hotfixes models intrudced in !1634 (merged) .

The fix goes down to a technicality about Lipschitz NNs (https://arxiv.org/abs/2112.00038) . The normalisation was not rigorously imposed, thus the robustness was not ensured via the Lipschitz constant.

These changes accomplish marginally better performance + the the afore-mentioned robustness.

Goes with lhcb-datapkg/ParamFiles!108