dojo: parse %as in ++parse-value instead of ++parse-build
dojo: parse %as in ++parse-value instead of ++parse-build

Allows things like `+hello &helm-hi 'hi'`. Fixes #1476.

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