fix: Scrollbars on the thumbnails to be auto visible (#2605)

The thumbnail view had hte scrollbars not visible and they didn't
appear, and that made it hard to discover how to scroll.

platform/ui/src/components/StudyBrowser/StudyBrowser.jsx

@@ -105,7 +105,7 @@ const StudyBrowser = ({
           })}
         </ButtonGroup>
       </div>
-      <div className="flex flex-col flex-1 overflow-auto invisible-scrollbar">
+      <div className="flex flex-col flex-1 overflow-auto">
         {getTabContent()}
       </div>
     </React.Fragment>