tests: Use global control interface in wait_go_ending_session()

P2P_EVENT_GROUP_REMOVED is a global event, so use
wait_global_event() instead of wait_event().

Signed-off-by: Ilan Peer <ilan.peer@intel.com>

tests/hwsim/wpasupplicant.py

@@ -646,7 +646,7 @@ class WpaSupplicant:
             except:
                 pass
             self.gctrl_mon = None
-        ev = self.wait_event(["P2P-GROUP-REMOVED"], timeout=3)
+        ev = self.wait_global_event(["P2P-GROUP-REMOVED"], timeout=3)
         if ev is None:
             raise Exception("Group removal event timed out")
         if "reason=GO_ENDING_SESSION" not in ev: