PB-173: Add Carousel Settings to Product Appearance

- fix static test

Author: omiroshnichenko

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/content-type/products/_carousel.less

@@ -71,7 +71,8 @@
         }
     }
 
-    &.center-mode, .center-mode {
+    &.center-mode,
+    .center-mode {
         .product-item {
             opacity: .5;
             transition: all 300ms ease;