LT-245: Fixing data sharing issue on studies browser

Packages/viewerbase/client/components/studyBrowser/thumbnailEntry/thumbnailEntry.html

@@ -1,7 +1,7 @@
 <template name="thumbnailEntry">
     <div class="thumbnailEntry m-t-1 m-b-2 {{draggableClass}} {{#if isSeriesActive this.thumbnail.stack.seriesInstanceUid viewportIndex}}active{{/if}}">
         <div class="p-x-1">
-            {{>imageThumbnail (extend this)}}
+            {{>imageThumbnail (clone this)}}
         </div>
         <div class="seriesDetails noselect m-a-1">
             <div class="seriesDescription">