vere: fix refcounting in _ames_forward
vere: fix refcounting in _ames_forward

Make sure we fully lose the list of lanes that's passed in, not just the
individual items.

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