Fix divider hidden delay if quick swipe to home

We didn't handle such case if transient bar enable and divider is
hidden by split side so it will have a delay.
Catch up it on handleNormalGestureEnd if end target is home.

Fix: 265755388
Test: manual
Test: pass existing tests
Change-Id: I09ac2a3a57c51473daf2b6887cd23bca505378f7

quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java

@@ -1283,6 +1283,9 @@ public abstract class AbsSwipeUpHandler<T extends StatefulActivity<S>,
             if (mRecentsAnimationController != null) {
                 mRecentsAnimationController.detachNavigationBarFromApp(true);
             }
+            if (mIsTransientTaskbar) {
+                setDividerShown(false /* shown */, true /* immediate */);
+            }
         } else if (endTarget == RECENTS) {
             if (mRecentsView != null) {
                 int nearestPage = mRecentsView.getDestinationPage();