style: remove modelines

[aucampia]

Summary of changes

EditorConfig should be used instead of modelines, and they are not used universally anyway.

Checklist

• Checked that there aren't other open pull requests for
  the same change.
• Checked that all tests and type checking passes.
• Considered granting push permissions to the PR branch,
  so maintainers can fix minor issues and keep your PR up to date.