Remove syn_max_lines and syn_prob_lines from training.py

The items syn_max_lines and syn_prob_lines should be removed from the dictionary.

changed milestone to %DAN-P2: Clean code and remove unused code

added P2 Quick Win labels

assigned to @schneider-y

mentioned in merge request !121 (closed)

Done in https://gitlab.com/teklia/atr/dan/-/merge_requests/129

closed