Sweep: Edit fails to parse some messages with invalid TOML

[ErikBjare]

Description

This pull request addresses an issue where the apply function in patch.py fails to correctly parse messages that contain invalid TOML due to unescaped backslashes. By adding an extra line of code, we ensure that all backslashes are properly escaped, thus preventing parsing errors and improving the robustness of the patch application process.

Summary

• Fixed a bug in gptme/tools/patch.py where unescaped backslashes in the input could lead to invalid TOML parsing errors.
• Added a line to apply function to replace single backslashes (\) with double backslashes (\\), ensuring proper escaping.
• This change enhances the reliability of the patching tool when dealing with inputs that contain backslashes.

Fixes #71.

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[ErikBjare]

No way this is correct