macro_use_import: Don't check is attribute comes from expansion

It is not possible to write a declarative macro, that produces an attribute w/o
an item attached to it. This means that the `check_item` will already insert the
span in the map, if it came from an expansion. So additionally checking if the
macro came from an expansion doesn't add anything here. So the
`check_attribute` function, and with that the problematic `attr.span()` call can
be completely removed.

Fixes #14303

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