Override the ::after element for variant images in the quick add moda…

…l and quick order list to remove shadows. (Shopify#3449)

assets/quick-order-list.css

@@ -36,6 +36,10 @@ quick-order-list .quantity__button {
   z-index: 1;
 }
 
+.variant-item__image-container.global-media-settings::after {
+  content: none;
+}
+
 @media screen and (min-width: 990px) {
   .quick-order-list__total {
     position: sticky;