paper: on no input fqme, load all mktinfos from pos table

piker/clearing/_paper_engine.py

@@ -557,6 +557,11 @@ async def trades_dialogue(
         # existing brokerd daemon?
         # - alternatively we can possibly expect and use
         # a `.broker.norm_trade_records()` ep?
+        fqmes: list[str] = [fqme]
+        if fqme is None:
+            fqmes = list(ppt.pps)
+
+        for fqme in fqmes:
             mkt: MktPair | None = None
             brokermod = get_brokermod(broker)
             gmi = getattr(brokermod, 'get_mkt_info', None)