Fix background animator not resetting

Test: Set wallpaper, make sure screen is not black.
Change-Id: I4031375e0892906a4e4085ce05664191a55bfb4e
Fixes: 32375010
(cherry picked from commit 7156b650f0d57522ebde67cebd201b339e08cf8e)
diff --git a/services/core/java/com/android/server/wm/DisplayContent.java b/services/core/java/com/android/server/wm/DisplayContent.java
index 10fecf4..7cd9971 100644
--- a/services/core/java/com/android/server/wm/DisplayContent.java
+++ b/services/core/java/com/android/server/wm/DisplayContent.java
@@ -2256,6 +2256,8 @@
     }
 
     void updateWallpaperForAnimator(WindowAnimator animator) {
+        resetAnimationBackgroundAnimator();
+
         final WindowList windows = mWindows;
         WindowState detachedWallpaper = null;