chat-hook: remove incorrect comment
We do, in fact, use it. Implicitly, when reestablishing the subscription during
kick handling.
%+ weld path.act
?~(mailbox /0 /(scot %ud (lent envelopes.u.mailbox)))
:_ state
- ::TODO we shouldn't include the trailing /0 or similar in the wire,
- :: we never use it anywhere, and it complicates other logic. see #2746
:~ [%pass chat-history %agent [ship.act %chat-hook] %watch chat-history]
[%give %fact [/synced]~ %chat-hook-update !>([%initial synced])]
==
