[whatwg/url] Do not return ipv4Host if IPv4 parsing fails (#524)

This seems like a typo - if IPv4 parsing returns failure, we should assume the string is a domain.


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### :boom: Error: 400 Bad Request :boom: ###

[PR Preview](https://github.com/tobie/pr-preview#pr-preview) failed to build. _(Last tried on Jun 2, 2020, 1:05 PM UTC)_.

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/524

-- Commit Summary --

  * Do not return ipv4Host if IPv4 parsing fails

-- File Changes --

    M url.bs (3)

-- Patch Links --

https://github.com/whatwg/url/pull/524.patch
https://github.com/whatwg/url/pull/524.diff

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