fix --rng-deterministic argparse bool parsing

[tempoo04]

Summary

Fix silent bug in codegen1/jaxformer/hf/sample.py:195 where --rng-deterministic flag never accepts False.

Problem

type=bool in argparse calls bool(str). Any non-empty string is True, including "False". So --rng-deterministic False silently keeps determinism on. Users cannot disable deterministic cuDNN via CLI.

Fix

Switch to argparse.BooleanOptionalAction:

[salesforce-cla]

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