Fix missing switch from key to attribute access in xfel-calibrate args after rework

src/xfel_calibrate/nb_args.py

@@ -423,7 +423,7 @@ def parse_argv_and_load_nb(argv) -> Tuple[Dict, NBDetails]:
               'location is sufficient for your '
               'needs.'.format(', '.join(not_reproducible_args)))
 
-        if not args['not_reproducible']:
+        if not args.not_reproducible:
             # If not explicitly specified that reproducibility may be
             # broken, remind the user and exit.
             print('To proceed, you can explicitly allow reproducibility to '