Fix matched values for :name* patterns. (#126)

[wanderview]

This fixes the problem where:

const p = new URLPattern({ pathname: ':name*' });
const r = p.exec('foobar');
console.log(r.pathname.groups.name);

Would log 'r' instead of 'foobar'.

This is an upstream bug in path-to-regexp:

pillarjs/path-to-regexp#260

This commit essentially applies the proposed fix in:

pillarjs/path-to-regexp#261

And adds the WPT tests from:

https://chromium-review.googlesource.com/c/chromium/src/+/3123654

[wanderview]

@kenchris PTAL

[kenchris]

Nice! Always love the test coverage