Refine notifications

https://github.com/tooot-app/app/issues/306

https://github.com/tooot-app/app/issues/305 This one uses the positive filtering that is added since v3.5, that a such a filter won't be shown as there is no way to check if a user is an admin or not and showing a useless option for majority users won't be a good experience.

src/@types/mastodon.d.ts

@@ -341,6 +341,7 @@ declare namespace Mastodon {
       | 'favourite'
       | 'poll'
       | 'status'
+      | 'update'
     created_at: string
     account: Account