give Mystery.py the create_diff argument, then make MultiMystery.py use them

Mystery.py

@@ -40,6 +40,7 @@ def mystery_argparse():
     parser.add_argument('--meta', default=None)
     parser.add_argument('--log_output_path', help='Path to store output log')
     parser.add_argument('--loglevel', default='info', help='Sets log level')
+    parser.add_argument('--create_diff', action="store_true")
     parser.add_argument('--yaml_output', default=0, type=lambda value: min(max(int(value), 0), 255),
                         help='Output rolled mystery results to yaml up to specified number (made for async multiworld)')
 
@@ -93,6 +94,7 @@ def main(args=None, callback = ERmain):
     erargs.seed = seed
     erargs.name = {x: "" for x in range(1, args.multi + 1)} # only so it can be overwrittin in mystery
     erargs.create_spoiler = args.create_spoiler
+    erargs.create_diff = args.create_diff
     erargs.race = args.race
     erargs.skip_playthrough = args.skip_playthrough
     erargs.outputname = seedname