Handle nitter instance in url: search filter
With searches, you can either use `url:<id>` or `url:<the actual url>`.

It doesn't work well with `<the actual url>`, because it's not handled, twitter doesn't know nitter.

Nitter should look for `url:`, replace the current nitter instance (and I also think nitter.net anyway) by twitter.com, remove trailing `#r` or `#m`, then send the request.