Update LiveData value when becoming active

Allow LiveData to stay up to date, especially when resuming an activity

examples/architectureComponentsExample/src/main/java/io/realm/examples/arch/livemodel/LiveRealmObject.java

@@ -87,6 +87,7 @@ protected void onActive() {
         super.onActive();
         T object = getValue();
         if (object != null && RealmObject.isValid(object)) {
+            setValue(object);
             RealmObject.addChangeListener(object, listener);
         }
     }