Fix soft reboot when triggering multiwindow with some PiP apps

To replicate the issue with Youtube vanced:
- play a video in YT vanced in portrait mode
- start multiwindow from navbar or slim recents

Todo: clean up this multiwindow sh#t

09-16 20:22:17.622   872   923 E AndroidRuntime: *** FATAL EXCEPTION IN SYSTEM PROCESS: android.display
09-16 20:22:17.622   872   923 E AndroidRuntime: java.lang.IllegalArgumentException: Drag resize mode not allow for stack stackId=4 dragResizeMode=1
09-16 20:22:17.622   872   923 E AndroidRuntime: 	at com.android.server.wm.Task.setDragResizing(Task.java:533)
09-16 20:22:17.622   872   923 E AndroidRuntime: 	at com.android.server.wm.TaskWindowContainerController.setTaskDockedResizing(TaskWindowContainerController.java:187)
09-16 20:22:17.622   872   923 E AndroidRuntime: 	at com.android.server.am.TaskRecord.setTaskDockedResizing(TaskRecord.java:500)
09-16 20:22:17.622   872   923 E AndroidRuntime: 	at com.android.server.am.ActivityStackSupervisor.notifyAppTransitionDone(ActivityStackSupervisor.java:2416)
09-16 20:22:17.622   872   923 E AndroidRuntime: 	at com.android.server.am.ActivityManagerService$LocalService.notifyAppTransitionFinished(ActivityManagerService.java:23993)
09-16 20:22:17.622   872   923 E AndroidRuntime: 	at com.android.server.wm.WindowManagerService$H.handleMessage(WindowManagerService.java:5341)
09-16 20:22:17.622   872   923 E AndroidRuntime: 	at android.os.Handler.dispatchMessage(Handler.java:106)
09-16 20:22:17.622   872   923 E AndroidRuntime: 	at android.os.Looper.loop(Looper.java:164)
09-16 20:22:17.622   872   923 E AndroidRuntime: 	at android.os.HandlerThread.run(HandlerThread.java:65)
09-16 20:22:17.622   872   923 E AndroidRuntime: 	at com.android.server.ServiceThread.run(ServiceThread.java:46)

Change-Id: I744016db9ba2abd0f6faf72ea8d5b8c4908766b7