herm: ignore legacy /tube wire responses
We use /$ now.
|= [=wire =sign-arvo]
^- (quip card:agent:gall _this)
?+ wire (on-arvo:def wire sign-arvo)
+ [%tube *] [~ this] :: we no longer care about these
+ ::
:: pass on dill blits for the session
::
[%view %$ ~]
