PB-210: PB-173 Bugs: Continuous Mode Not Rendering Correct Opacity Through Block in Admin

- fix css for dynamic block with carousel in continuous mode

Author: omiroshnichenko

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

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