chat-cli: ensure bound map is sorted
chat-cli: ensure bound map is sorted

During upgrade, we gassed _in_ a map, instead of _by_, causing it to use
set-style sorting, leading to incorrect lookups.

This fixes that upgrade logic, and re-builds the map for existing instances.
urbit/urbit,jfranklin9000/urbit,ngzax/urbit,urbit/urbit,jfranklin9000/urbit,jfranklin9000/urbit,ngzax/urbit,jfranklin9000/urbit,urbit/urbit,jfranklin9000/urbit,ngzax/urbit,urbit/urbit,jfranklin9000/urbit,jfranklin9000/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,ngzax/urbit