[FIX] tools: fix guess_mimetype coming from libmagic

Since 5a9e1af64 our guess_mimetype accepted a `default` named argument.

This commit fix the use of library used instead of our implementation, so
we don't get an error from an unexpected argument when having python-magic
installed on a given server.

Since python-magic functions always return a default mimetype:

- empty content: application/x-empty
- text content: text/plain
- binary content: application/octet-stream

the guess_mimetype default argument is not used with python-magic
implementations.

closes #13343
opw-687354

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