Add the leaf task to the recents animation target

- The root task in splitscreen is the secondary shell root

Change-Id: I298c846ef813fff5a1bfff8087a45054ff8957d7
Bug: 157624680
Test: Quickswitch in fullscreen and in splitscreen

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

@@ -3510,7 +3510,7 @@ class Task extends WindowContainer<WindowContainer> {
                 ProtoLog.d(WM_DEBUG_RECENTS_ANIMATIONS,
                         "applyAnimationUnchecked, control: %s, task: %s, transit: %s",
                         control, asTask(), AppTransition.appTransitionToString(transit));
-                control.addTaskToTargets(getRootTask(), finishedCallback);
+                control.addTaskToTargets(this, finishedCallback);
             }
         } else {
             super.applyAnimationUnchecked(lp, enter, transit, isVoiceInteraction, finishedCallback);