restore aeon to 'scry-request' response wire

[sidnym-ladrut]

During the ames ack migration (10d6061), the aeon parameter was removed from the scry-request response wire, which inadvertently caused app/simple.hoon to reference unused agent paths.

The existing signature for +tell:da, which also expects the aeon parameter for a scry-request, suggests that this omission was unintentional. This PR simply restores the aeon in this wire with the values it used prior to 10d6061.

To test the correctness of this fix, I ran the following test case on two fake ships ~zod and ~nec with the SSS desk installed as %simple:

>> ~zod
> :simple &add 1
>> ~nec
> :simple &surf-sum [~zod %sum %foo ~]

Diffing the dojo outputs before and after the inclusion of this fix yields the following:

$ diff log-old.txt log-new.txt
31c31,32
< %simple: on-agent on wire //sss/scry-request/~zod/simple/sum/foo, %poke-ack
---
> %simple: on-agent on wire //sss/scry-request/~zod/simple//sum/foo, %poke-ack
> >   "sub-sum is: ~"

The fact that the sub-sum is: line is now being printed after the scry-request response suggests that the fix is working. Feel free to let me know if there are any other tests cases I should run to verify correctness.

[johnhyde]

Nice, I think if you made a PR here, it would probably get merged sooner.