Checklist

• I've checked that there is no other issue about this feature request.
• This issue contains only one feature request.
• The title of this issue accurately describes the feature request.

Feature description

Currently when a user clicks on logout in the webview it still leaves a cookie value behind. This makes InnerTune think the user would still be logged in while this is not the case.

Why do you want this feature?

InneTune has some special behaviour for logged in users only.
This does not make sense anymore when the user logged out.
But currently it still does it because the cookie value is not fully cleared.

Additional information

The cookie value should be null again after logout.