style(购物车)：调整代码格式

src/main/java/com/uas/platform/b2c/trade/presale/service/impl/CartServiceImpl.java

@@ -516,7 +516,7 @@ public class CartServiceImpl implements CartService {
 		}else {
 			cart.setNumber(commodity);
 		}
-		cart.setCurrencyName(Currency.USD.equals(commodity.getCurrencyName()) ? "USD" : "RMB");
+		cart.setCurrencyName(Currency.USD.equals(commodity.getCurrencyName()) ? Currency.USD : Currency.RMB);
 		cart.setReturnInWeek(commodity.getReturnInWeek());
 		cart.setSupply(commodity.getOriginal());
 		cart.setPack(commodity.getPackaging());