[libandroid_graphics] Add a missing release() call

RenderProxy acquires its own references to the ANativeWindow and does
not steal it, so there needs to be an additional ANativeWindow_release
call in setSurface

Test: builds
Test: interact with device
Change-Id: I598f57febf835cda7fb4195b19e03c3723698702

core/jni/android_view_ThreadedRenderer.cpp

@@ -186,6 +186,7 @@ static void android_view_ThreadedRenderer_setSurface(JNIEnv* env, jobject clazz,
         proxy->setSwapBehavior(SwapBehavior::kSwap_discardBuffer);
     }
     proxy->setSurface(window, enableTimeout);
+    ANativeWindow_release(window);
 }
 
 static jboolean android_view_ThreadedRenderer_pause(JNIEnv* env, jobject clazz,