Revert workaround for missing frame callback

Bug: 109701914
Test: Long swipe from an app and ensure the app window is hidden
Change-Id: Ice2978687e2049d5cfb20f3f7ce93906246c30b6
diff --git a/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java b/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
index 66bc501..410daa3 100644
--- a/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
+++ b/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
@@ -1021,8 +1021,6 @@
     private void setTargetAlphaProvider(
             BiFunction<RemoteAnimationTargetCompat, Float, Float> provider) {
         mClipAnimationHelper.setTaskAlphaCallback(provider);
-        // TODO: For some reason, when calling updateFinalShift multiple times on the same frame,
-        // only the first callback is executed.
-        Utilities.postAsyncCallback(mMainThreadHandler, this::updateFinalShift);
+        updateFinalShift();
     }
 }