Fix pyink formatting

[huytransformer]

Description

Fix pyink formatting in spmd_diloco_checkpointing.py

Checklist

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• I have performed a self-review of my code. For an optional AI review, add the gemini-review label.
• I have necessary comments in my code, particularly in hard-to-understand areas.
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• I have made or will make corresponding changes to the doc if needed, including adding new documentation pages to the relevant Table of Contents (toctree directive) as explained in our documentation.

[gemini-code-assist]

Code Review

This pull request reformats several multi-line statements in spmd_diloco_checkpointing.py into single lines to improve readability and code conciseness. I have no feedback to provide as there are no review comments.

[codecov]

Codecov Report

❌ Patch coverage is 58.33333% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...trainers/diloco/utils/spmd_diloco_checkpointing.py	58.33%	3 Missing and 2 partials ⚠️

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