link-proxy-hook: correctly scry initial response
link-proxy-hook: correctly scry initial response

Was using "manual" scries, and incorrect ones at that. Would crash, causing
subscriptions to not go through. Now uses the helper function and correct paths.
ngzax/urbit,ngzax/urbit,jfranklin9000/urbit,jfranklin9000/urbit,jfranklin9000/urbit,ngzax/urbit,ngzax/urbit,jfranklin9000/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,urbit/urbit,jfranklin9000/urbit,jfranklin9000/urbit,urbit/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,jfranklin9000/urbit