fix example android app to pass in react native host

examples/SimpleExample/android/app/src/main/java/com/simpleexample/MainApplication.java

@@ -24,7 +24,7 @@ public class MainApplication extends Application implements ReactApplication {
     protected List<ReactPackage> getPackages() {
       return Arrays.<ReactPackage>asList(
           new MainReactPackage(),
-            new RNThreadPackage()
+          new RNThreadPackage(mReactNativeHost)
       );
     }