Change expand animation for private space container.

Only scroll to bottom. Don't use the animation.

bug: 299294792
test: manual:
video: https://drive.google.com/file/d/134Mq0MX0xauRfkNv8LGXOZgweRjqrmTa/view?usp=sharing
Flag: ACONFIG com.android.launcher3.Flags.private_space_animation TEAMFOOD
Change-Id: Ie6666638a53e334bddb1700674c2c49eb5788a06

src/com/android/launcher3/allapps/PrivateSpaceHeaderViewController.java

@@ -120,11 +120,7 @@ public class PrivateSpaceHeaderViewController {
                 (ActivityAllAppsContainerView<?>.AdapterHolder) mAllApps.mAH.get(MAIN);
         if (Flags.enablePrivateSpace() && Flags.privateSpaceAnimation()
                 && mAllApps.getActiveRecyclerView() == mainAdapterHolder.mRecyclerView) {
-            RecyclerViewAnimationController recyclerViewAnimationController =
-                    new RecyclerViewAnimationController(mAllApps);
-            recyclerViewAnimationController.animateToState(true /* expand */,
-                    ANIMATION_DURATION, () -> {});
-            mAllApps.getActiveRecyclerView().scrollToBottomWithMotion();
+            mAllApps.getActiveRecyclerView().scrollToBottomWithMotion(ANIMATION_DURATION);
         }
     }