Re: [whatwg/url] Needs to ignore repeated slashes in file URL (#232)

Yet another sample:
`file://localhost///a//../..//`

Currently it is serialized to:
`file://////`

It shows what repeated leading slashes must be removed at the end of path parse (path state), when all possible `/../` are resolved. At this point `localhost` is already converted to empty host, so when switching from path state or at EOF:

- If url’s scheme is "file" and url’s host is empty, then remove all leading empty strings from path excluding last path's string.

This also works for pathname setter.

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