修复免单活动时，C端展示问题

shopping-cart-application-service/src/main/java/cn/freemud/service/impl/calculate/CalculationCommonService.java

@@ -135,6 +135,12 @@ public class CalculationCommonService {
         cartGoods.setAmount(find.getRealAmount());
         cartGoods.setCurrentCouponDiscount(0);
         cartGoods.setFinalPrice(find.getNowPrice());
+        // fix 免单情况，C端展示问题
+        int activityNumber = 0;
+        for (CalculationSharingDiscountResponseDto.CalculationDiscountResult.Goods.GoodsDiscount discount : find.getDiscounts()) {
+            activityNumber += discount.getActualGoodsNumber();
+        }
+        cartGoods.setActivityNumber(activityNumber);
         if (CollectionUtils.isNotEmpty(find.getDiscounts())){
             CalculationSharingDiscountResponseDto.CalculationDiscountResult.Goods.GoodsDiscount goodsDiscount = find.getDiscounts().stream()
                     .filter(p -> p.getActivityCode().equals(couponCode)).findFirst().orElse(null);