The results from the recoll engine were not displaying the usual
toggle for showing media previews. After the changes described bellow,
the toggle is displayed and works as expected.
In the JSON returned by recoll-webui, the field containing the
mimetype is actually `mtype`, not `mime`.
Furthermore, according to the documentation for the `File` class in
`searx/result_types/file.py`, `embedded` should contain the URL to the
media itself. The embedding of the media into the page for preview is
done in `searx/templates/simple/result_templates/file.html`.
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