fix ++sein not to hard-code ~zod
fix ++sein not to hard-code ~zod

(cherry picked from commit 92158ba5ce9c35a42ba725020007c8b992d16ca5)

urbit/urbit,cgyarvin/arvo,ohAitch/arvo,ngzax/urbit,joemfb/arvo,jfranklin9000/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,jfranklin9000/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,Fang-/arvo,ohAitch/arvo,jfranklin9000/urbit,jfranklin9000/urbit,joemfb/arvo,belisarius222/arvo,jfranklin9000/urbit,cgyarvin/arvo,jfranklin9000/urbit,belisarius222/arvo,jfranklin9000/urbit,urbit/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,urbit/urbit