groups: World Privacy icon fix
groups: World Privacy icon fix

Although the bug was poetic, this makes the icon in GroupLink aware of the group's hidden status and surfaces a lock icon in those cases instead of the "public" globe icon.
urbit/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit