fix:完善aster账户净值和盈亏计算|Improve the calculation of the net value and profit/loss of the aster account (#695)

Co-authored-by: LindenWang <linden@Lindens-MacBookPro-2.local>

trader/binance_futures.go

@@ -491,8 +491,6 @@ func (t *FuturesTrader) CloseShort(symbol string, quantity float64) (map[string]
 	return result, nil
 }
 
-
-
 // CancelStopLossOrders 仅取消止损单（不影响止盈单）
 func (t *FuturesTrader) CancelStopLossOrders(symbol string) error {
 	// 获取该币种的所有未完成订单