Prevent Smart App Banner from displaying on iOS

[insin]

We could try using declarativeNetRequest (DNR) to redirect https://twitter.com/.well-known/apple-app-site-association to an empty JSON file.

Since it's possible to dynamically enable and disable DNR rulesets, it could be made part of the Hide "Open app" nags feature (which I don't think is currently doing anything - Twitter seem to have removed the "Open app" button which used to display in the header when viewing a Tweet on mobile).

The Safari version is already using MV3, so we could potentially do this without having to re-ask the other 200,000+ users for permissions.