fix(thumbnails): expand multi studies scrollbar (#3224)

made per study scrollbars visible

platform/ui/src/components/ThumbnailList/ThumbnailList.tsx

@@ -12,7 +12,7 @@ const ThumbnailList = ({
   activeDisplaySetInstanceUIDs = [],
 }) => {
   return (
-    <div className="py-3 bg-black overflow-y-hidden ohif-scrollbar">
+    <div className="py-3 bg-black overflow-y-hidden ohif-scrollbar study-min-height">
       {thumbnails.map(
         ({
           displaySetInstanceUID,