addurl: Always use whole url as destination filename, rather than only its file component.

First, this ensures that git annex addurl, when run repeatedly with the
same url, doesn't create duplicate files, which it did before when it
fell back to the longer filename.

Secondly, the file part of an url is frequently not very descriptive on its
own.

The uri scheme, auth, and port is intentionally left out, as clutter.

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