arvo-ropsten: revert ALEF to AMES [ci skip]
arvo-ropsten: revert ALEF to AMES [ci skip]

f035955a renamed %alef to %ames, so the Ropsten Arvo derivation should
be updated accordingly.

jfranklin9000/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,jfranklin9000/urbit,urbit/urbit,jfranklin9000/urbit,jfranklin9000/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,jfranklin9000/urbit,jfranklin9000/urbit,ngzax/urbit,ngzax/urbit,ngzax/urbit,jfranklin9000/urbit,urbit/urbit,urbit/urbit