link-proxy-hook: fix incorrect scry paths
link-proxy-hook: fix incorrect scry paths

We were scrying for /gx/path instead of /gx/=link-store=/path.
In the %annotations case, that path wasn't even correct.

Also refactors scries out into a +scry-for helper.

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