Drop `open_pps()` from ems tests

tests/test_ems.py

@@ -42,7 +42,7 @@ from piker.accounting import (
     unpack_fqme,
 )
 from piker.accounting import (
-    open_pps,
+    open_account,
     Position,
 )
 
@@ -136,7 +136,7 @@ def load_and_check_pos(
 
 ) -> None:
 
-    with open_pps(ppmsg.broker, ppmsg.account) as table:
+    with open_account(ppmsg.broker, ppmsg.account) as table:
 
         if ppmsg.size == 0:
             assert ppmsg.symbol not in table.pps