Use aconfig flag enable_split_contextual

Bug: 276361926
Test: Basic split contextual operations work
as expected

Change-Id: I7202654f8452a0c57e5e728c9baaadf85fa22a96
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index c0520c1..9255ff4 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -1578,7 +1578,7 @@
                 }
             }
 
-            if (FeatureFlags.ENABLE_SPLIT_FROM_WORKSPACE_TO_WORKSPACE.get()) {
+            if (FeatureFlags.enableSplitContextually()) {
                 handleSplitAnimationGoingToHome();
             }
             mOverlayManager.hideOverlay(isStarted() && !isForceInvisible());