prerender: The `url` is triming the fragment under prerender

## Bug Report **Current Behavior** When saving a URL that includes a fragment identifier, the meta API `url` response field strips out any fragment identifier that was in the original URL In: https://example.com/#hello Out: https://example.com/ **Expected behavior/code** I expect the `url` field to show what's in the browser address bar after the page loads. If following the link in my browser preserves the fragment, so should Microlink. **Additional context/Screenshots** This is a problem for my use case: I use the `url` field to get a canonical link to show users, since it resolves HTTPS redirects, shortlinks, etc. I can't do that if the `url` field strips out important data (text highlights, or which part of the page is being linked to).