drum: don't drop state during se-subze
Previously, it was putting new session state into the old map,
preserving only the state of the last session in the map.
=< .(con +>)
|: $:,[[ses=@tas dev=source] con=_.] ^+ con
=+ xeno=se-subze-local:%_(con ses ses, dev dev)
- xeno(ses ses.con, dev dev.con, bin (~(put by bin) ses dev.xeno))
+ xeno(ses ses.con, dev dev.con, bin (~(put by bin.xeno) ses dev.xeno))
::
++ se-subze-local
^+ .
