#25652: Arrows (.fotorama__thumb__arr) don't work in product gallery

- Fotorama disabled arrows are hidden by opacity:0
- Internal ticket: MC-28947

Author: alexey-rakitin

lib/web/mage/gallery/gallery.less

@@ -418,9 +418,8 @@
 }
 
 .fotorama__arr--disabled {
-    *display: none;
     cursor: default;
-    opacity: 0.1;
+    opacity: 0;
     pointer-events: none;
 }