[url] Counterintuitive step in `non-relative-url(input)` (#48)

https://specs.webplatform.org/url/webspecs/develop/#rule-non-relative-url

```
  2. If the value of scheme does not match any relative scheme then return failure.
```
This seems backwards to me -- given a relative scheme, we'd want the parser to continue to **relative-url**, right?

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Reply to this email directly or view it on GitHub:
https://github.com/webspecs/url/issues/48