Add DIF to MC production scripts

Control/CalypsoExample/Generation/python/faser_parser.py

@@ -47,7 +47,7 @@ def faser_pgparser():
     parser.add_argument("--zpos", default=None, type=float,
                         help="Specify z position of particles (in mm) (helpful to avoid FASERnu)")
 
-    parser.add_argument("--pidd1", default=211, type=int, 
+    parser.add_argument("--pidd1", default=None, type=int, 
                         help="Specify PDG ID of daugther 1 for DIF generator")
     parser.add_argument("--pidd2", default=None, type=int, 
                         help="Specify PDG ID of daugther 2 for DIF generator")