Fix stack animation background coordinates.

Forgot that we aren't yet in a relative coordinate space for the stack!

Bug: 69623943
Test: Manual
Change-Id: Id4285355dc0da967f450dacd0eb59372be9d2426

services/core/java/com/android/server/wm/TaskStack.java

@@ -257,8 +257,9 @@ public class TaskStack extends WindowContainer<Task> implements
         if (mAnimationBackgroundSurface == null) {
             return;
         }
+        // TODO: Should be in relative coordinates.
         getPendingTransaction().setSize(mAnimationBackgroundSurface, bounds.width(), bounds.height())
-                .setPosition(mAnimationBackgroundSurface, 0, 0);
+                .setPosition(mAnimationBackgroundSurface, bounds.left, bounds.top);
         scheduleAnimation();
     }