there's no need to override the line decorations now that are the defaults

Switch from the brutalist approach to a prettier ones. If someone likes the old brutalist theme, it's still available as contrib/brutalist.config: $ cp contrib/brutalist.config ~/.telescope/config or $ telescope -c contrib/brutalist

don't need to evtimer_add to initialize the event.

don't consider an invalid tab id as an error. Things are asynchronous, we may issue a request but then stop it, and still get data relative to that. So, ignore the request when we get an invalid id.