[w3c/manifest] Processing icons uses manifest_url when it should probably use start_url (#1004)

https://www.w3.org/TR/appmanifest/#processing-image-resources

This uses the manifest_url as the base url, when this can be a different origin from the start_url origin (and scope). This seems like maybe something that should be fixed?

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https://github.com/w3c/manifest/issues/1004