Remove syn_*lines from code

Closes #63 (closed)

dan/ocr/document/train.py

@@ -212,6 +212,8 @@ def get_config():
                 "cer",
                 "wer",
                 "wer_no_punct",
+                "syn_max_lines",
+                "syn_prob_lines",
             ],  # Metrics name for training
             "eval_metrics": [
                 "cer",