[Mod] Binance spot trade websocket account event

event key has changed: outboundAccountInfo -> outboundAccountPosition, https://binance-docs.github.io/apidocs/spot/cn/#payload

vnpy/gateway/binance/binance_gateway.py

@@ -629,7 +629,7 @@ def on_connected(self):
 
     def on_packet(self, packet: dict):  # type: (dict)->None
         """"""
-        if packet["e"] == "outboundAccountInfo":
+        if packet["e"] == "outboundAccountPosition":
             self.on_account(packet)
         elif packet["e"] == "executionReport":
             self.on_order(packet)