Stop Discord prompting for auth on every login

[supermathie (Michael Brown)]

@Mako-Poisoned

Even with the change, it still proceeds you to the discord authentication page - which it shouldn’t do (although this time you don’t need to manually press authenticate).

This is how Discord themselves advise the flow to work:

prompt controls how the authorization flow handles existing authorizations. If a user has previously authorized your application with the requested scopes and prompt is set to consent, it will request them to reapprove their authorization. If set to none, it will skip the authorization screen and redirect them back to your redirect URI without requesting their authorization. For passthrough scopes, like bot and webhook.incoming, authorization is always required.

emphasis:

If set to none, it will skip the authorization screen

@Mako-Poisoned

Submitting a PR with the suggested change unfortunately would not fix the issue

Not showing the authorization screen at all is something that only Discord themselves can control; this is not on us to fix (with prompt=none set).