Set `.bs_mktid` on all IB position-msg emissions..

piker/brokers/ib/broker.py

@@ -358,6 +358,10 @@ async def update_and_audit_pos_msg(
         size=ibpos.position,
 
         avg_price=pikerpos.ppu,
+
+        # XXX ensures matching even if multiple venue-names
+        # in `.bs_fqme`, likely from txn records..
+        bs_mktid=mkt.bs_mktid,
     )
 
     ibfmtmsg: str = pformat(ibpos._asdict())
@@ -426,7 +430,8 @@ async def aggr_open_orders(
 
 ) -> None:
     '''
-    Collect all open orders from client and fill in `order_msgs: list`.
+    Collect all open orders from client and fill in `order_msgs:
+    list`.
 
     '''
     trades: list[Trade] = client.ib.openTrades()