Set default taxometer batch steps to no steps

The previous defaults were conflicting, since the default number of epochs
was smaller than the last steps.
Previous runs have indicated that no steps is a good option, though I believe
we have never done any optimization on this.

vamb/__main__.py

@@ -1863,7 +1863,7 @@ def add_predictor_arguments(subparser):
         metavar="",
         type=int,
         nargs="*",
-        default=[25, 75, 150, 225],
+        default=[],
         help=argparse.SUPPRESS,
     )
     pred_trainos.add_argument(