[feat]修改活动页关闭按钮ui

lib/module/store/new_discount/new_discount_page.dart

@@ -86,7 +86,7 @@ class NewDiscountPage extends BasePage<NewDiscountController> {
           children: [
             GestureDetector(
               onTap: controller.clickBack,
-              child: Assets.images.iconStoreBack.image(
+              child: Assets.images.iconDiscountClose.image(
                 width: 32.w,
                 height: 32.w,
               ),