Fix issue with settings launch animation

- Remove call to override the windowing mode, it seems like we already
  create a new root task with the right windowing mode now

Bug: 152439204
Test: Launch settings from quick settings over home,
      ensure that animation plays
Change-Id: I48f747a7f4fdf664945b02d1fb3694ab454cf35e

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

@@ -168,7 +168,6 @@ class ActivityStarter {
 
     // The task display area to launch the activity onto, barring any strong reason to do otherwise.
     private TaskDisplayArea mPreferredTaskDisplayArea;
-    // The windowing mode to apply to the root task, if possible
     private int mPreferredWindowingMode;
 
     private Task mInTask;
@@ -1560,9 +1559,6 @@ class ActivityStarter {
         if (!mAvoidMoveToFront && mDoResume) {
             mTargetStack.getStack().moveToFront("reuseOrNewTask", targetTask);
             if (mOptions != null) {
-                if (mPreferredWindowingMode != WINDOWING_MODE_UNDEFINED) {
-                    mTargetStack.setWindowingMode(mPreferredWindowingMode);
-                }
                 if (mOptions.getTaskAlwaysOnTop()) {
                     mTargetStack.setAlwaysOnTop(true);
                 }