[w3c/manifest] Make the default scope the origin rather than the parent directory of the start_url (#993)

Users are able to install sites without manifests as web apps. The default scope used will be the parent directory of the page they installed.
[Spec](https://www.w3.org/TR/appmanifest/#scope-member)

I think for many sites it makes more sense to default scope to the entire origin rather than the start_url's parent directory.
User feedback: https://bugs.chromium.org/p/chromium/issues/detail?id=1236594


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