Sort format controls to ensure consistent results

[richafrank]

Sort format controls when writing them to ensure consistent results

Fixes #1097

Changelog-friendly one-liner: Sort format controls to ensure consistent results

Contributor checklist

• Provided the tests for the changes.
• Gave a clear one-line description in the PR (that the maintainers can add to CHANGELOG.md on release).
• Assign the PR to an existing or new milestone for the target version (following Semantic Versioning).

[codecov]

Codecov Report

Merging #1098 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1098      +/-   ##
==========================================
- Coverage   99.42%   99.42%   -0.01%     
==========================================
  Files          34       34              
  Lines        2443     2441       -2     
  Branches      302      302              
==========================================
- Hits         2429     2427       -2     
  Misses          8        8              
  Partials        6        6              

Impacted Files	Coverage Δ
piptools/utils.py	100.00% <ø> (ø)
piptools/writer.py	99.25% <100.00%> (ø)
tests/test_writer.py	100.00% <100.00%> (ø)

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[atugushev]

LGTM 👍

[atugushev]

Thanks, @richafrank for fixing and @auvipy for reviewing this! 🙏