Fix begin: allow answer of "no"
Fix begin: allow answer of "no"

When begin asks the user "Do you have a ship and a ticket?", the answer
"no" is considered invalid. This fixes the problem.

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