Update knockout-tests.ts

Added a different versión of init, which returns an object instead of void.

knockout/tests/knockout-tests.ts

@@ -163,6 +163,7 @@ function test_bindings() {
 
     ko.bindingHandlers.yourBindingName = {
         init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
+        	return { "controlsDescendantBindings": true };
         },
         update: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
         }
@@ -655,4 +656,4 @@ function testUnwrapUnion() {
     var possibleObs: KnockoutObservable<number> | number;
     var num = ko.unwrap(possibleObs);
 
-}
+}