Eliminate unnecessary nesting.

src/client/js/components/User/SeenUserList.jsx

@@ -20,7 +20,7 @@ const SeenUserList = (props) => {
   const toggle = () => setPopoverOpen(!popoverOpen);
   const { pageContainer } = props;
   return (
-    <div>
+    <>
       <Button id="po-seen-user" color="link" className="px-2">
         <span className="mr-1 footstamp-icon"><FootstampIcon /></span>
         <span className="seen-user-count">{pageContainer.state.countOfSeenUsers}</span>
@@ -32,7 +32,7 @@ const SeenUserList = (props) => {
           </div>
         </PopoverBody>
       </Popover>
-    </div>
+    </>
   );
 };