FE does not properly hide TWKN when restrict_unauthenticated is configured to restrict it

Pleroma-FE doesn't properly hide the TWKN timeline when the restrict_unauthenticated/timelines/federated setting is set to true and the visitor is not logged in. Instead, the page is still visible under the timelines tab and shows the error shown below.

 Error fetching timeline: t.map is not a function 

This should probably be handled more gracefully (disable the endpoint and hide it from the navbox would be one way to do so).