Use ol.Collection#extend in examples

This commit changes the examples to using ol.control.defaults().extend to extend the collection of controls. This is in preparation for a future commit that will remove the 2nd argument to ol.control.defaults. The same is done for ol.interaction.defaults.

examples/ten-thousand-points.js

@@ -42,7 +42,7 @@ var lineStringCollection = ol.geom2.LineStringCollection.pack([
 ]);
 
 var map = new ol.Map({
-  controls: ol.control.defaults({}, [
+  controls: ol.control.defaults().extend([
     new ol.control.MousePosition({
       undefinedHTML: ' '
     })