Fix gguf importing

[JPPhoto]

Summary

Importing a gguf file results in:

Exception: The model file "blah.gguf" is potentially infected by malware. Aborting import.

This happens because gguf files are scanned for malware and return an error; the file format does not suffer from the same problems as pickled files and does not need to be scanned.

This PR removes the scan from gguf files but keeps it for other potentially-unsafe formats.

Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Tests added / updated (if applicable)
• Documentation added / updated (if applicable)
• Updated What's New copy (if doing a release after this PR)

[psychedelicious]

Good catch, thanks JP!