lsupstreams: Prefer more specific remote prefixes in prefixmap

In order to support Downstream Hosts with restricted repository
hierarchies (like Gitea's 2 levels), it is useful to be able to map
both a directory and a subdirectory of it from an Upstream Host that
has a deeper hierarchy.

Convert the prefixmap into a list of (remote, local) tuples and sort
in reverse order, so that a subdirectory prefix will appear before its
parent directory prefix if both are present.

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