Remove unneeded type cast from examples

examples/popup.js

@@ -18,13 +18,13 @@ var closer = document.getElementById('popup-closer');
 /**
  * Create an overlay to anchor the popup to the map.
  */
-var overlay = new ol.Overlay(/** @type {olx.OverlayOptions} */ ({
+var overlay = new ol.Overlay({
   element: container,
   autoPan: true,
   autoPanAnimation: {
     duration: 250
   }
-}));
+});
 
 
 /**