hark-graph-hook: revive unread counts for group feed
hark-graph-hook: revive unread counts for group feed

Fixes urbit/landscape#1258

urbit/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,ngzax/urbit