[whatwg/url] Fix handling of spaceAsPlus in percent-encode after encoding (#570)

Closes #569.

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- [X] At least two implementers are interested (and none opposed):
   * This is a spec bug introduced in #558; all browsers do the right thing here.
- [X] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * This is tested in [https://github.com/web-platform-tests/wpt/blob/master/url/url-searchparams.any.js], for example.
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(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

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

  https://github.com/whatwg/url/pull/570

-- Commit Summary --

  * Fix handling of spaceAsPlus in percent-encode after encoding

-- File Changes --

    M url.bs (2)

-- Patch Links --

https://github.com/whatwg/url/pull/570.patch
https://github.com/whatwg/url/pull/570.diff

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