Remove unneeded type cast from examples

examples/navigation-controls.js

@@ -8,9 +8,9 @@ goog.require('ol.source.OSM');
 
 var map = new ol.Map({
   controls: ol.control.defaults({
-    attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
+    attributionOptions: {
       collapsible: false
-    })
+    }
   }).extend([
     new ol.control.ZoomToExtent({
       extent: [