Format sample fixture checker warning

[neubig]

Summary

• apply the ruff-format rewrite for the sample fixture checker warning expression

Validation

• python scripts/check_sample_fixtures.py --dataset openthoughts_agent_sft
• python -m py_compile scripts/check_sample_fixtures.py
• uv run --no-project --python /usr/bin/python3.12 --with-requirements requirements.txt pre-commit run ruff-format --files scripts/check_sample_fixtures.py

[github-actions]

🟢 Good taste — pure ruff-format rewrite with no logic change. Approved.

[RISK ASSESSMENT]

• [Overall PR] ⚠️ Risk Assessment: 🟢 LOW — formatting-only change with identical runtime behaviour.

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