fix item centering at the end of the map list

Author: flustix

fluXis/Screens/Select/List/MapList.cs

@@ -145,7 +145,7 @@ public void ScrollToItem(IListItem item, bool smooth = true)
 
         if (center < DisplayableContent / 2)
             ScrollTo(0, smooth);
-        else if (center > ScrollableExtent - DisplayableContent / 2)
+        else if (center > ScrollableExtent + DisplayableContent / 2)
             ScrollToEnd(smooth);
         else
             ScrollTo(center - DisplayableContent / 2, smooth);