Close temp file before passing it to editor to prevent file locking issues in Windows

[micahellison]

When jrnl creates a temp file to pass to the user's custom editor, it doesn't close that temp file first. This doesn't seem to be an issue on *nix, but in Windows, this makes editing impossible because the editor can't get a write lock on the file.

Checklist

• The code change is tested and works locally.
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Fixes #790

[wren]

👍

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