In 6b266b7815, as I got rid of deprecated dep `wurl`, I wrote:
> This one may be problematic, as it used to do TLD stuff:
> https://github.com/websanova/node-url/blob/7982a613bc/wurl.js#L4
>
> So, the new WHATWG-URL-based implementation will consider
> `asana.com` to be "external" to `app.asana.com`, contrarily to before.
> Given the nature of Nativefier, I think it's actually what to expect,
> that in this case you're "out of the app", and in e.g. asana's landing
> page, which you'd expect to see in your browser.
Turns out it's even more problematic: @TheCleric notices in https://github.com/nativefier/nativefier/pull/1124#issuecomment-790279403
that this breaks app `https://evernote.com` doing its login in `www.evernote.com`
The present change fixes this, by behaving mostly similarly to before,
but without re-introducing `wurl` or another dep needing a TLD/SLD list.