shared-mime-info: image/x-fits -> image/fits

[Michael Noble]

Dear All,

> I would say that current behaviour of the loader exactly matches
> the description of image/fits mime type.
> BTW: I'm not the author if the loader, the [current] author (Michael S. Noble)
> is CC-ed.

Much thanks for keeping this thread going, but I have no time to
digest or comment at present because I am away attending a funeral.

Regards,
-Mike