--remove-unused-ignores doesn't respect existing line endings

[mayty]

Describe the Bug

Steps to reproduce:

1. Have .py files with CRLF line endings
2. Run pyrefly check --remove-unused-ignores

Expected result:
Line ending on all files remains the same.

Actual result:
Line ending on all .py files changes to LF, even in otherwise unchanged files (for both Windows and Linux).

Sandbox Link

No response

(Only applicable for extension issues) IDE Information

No response

[maggiemoss]

Nice catch! Thanks for reporting, I'll take a look

[github-actions]

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