`onAnimatedValueUpdate` should also include offset

Summary:
Native Android implementation of animation listeners reports value only, and does not include offset. For non-native animation, the JavaScript listeners receive the animated node value + the animated node offset. Here's where the JavaScript node calls the listeners:
046f600cc2/Libraries/Animated/src/AnimatedImplementation.js (L942)
 and here's how `__getValue()` is calculated:
 046f600cc2/Libraries/Animated/src/AnimatedImplementation.js (L741-L743)

cc janicduplessis kmagiera
Closes https://github.com/facebook/react-native/pull/15500

Differential Revision: D5638336

Pulled By: shergin

fbshipit-source-id: d2104fdb483d9db3b856d625d021cceaa9232787

ReactAndroid/src/main/java/com/facebook/react/animated/ValueAnimatedNode.java

@@ -49,7 +49,7 @@ import javax.annotation.Nullable;
     if (mValueListener == null) {
       return;
     }
-    mValueListener.onValueUpdate(mValue);
+    mValueListener.onValueUpdate(getValue());
   }
 
   public void setValueListener(@Nullable AnimatedNodeValueListener listener) {