Use fullscreen task to test orientation request

Freeform task isn't allowed to request orientation change to display, so
we need to use fullscreen task.

Bug: 168750793
Test: atest PinnedStackTests#testSetRequestedOrientationWhilePinned on
freeform first device.
Test: atest PinnedStackTests#testSetRequestedOrientationWhilePinned on
freeform on crosshatch.

Change-Id: If397d9fee650ba6989d85951af3c85eefcd115d3
(cherry picked from commit 031ad976ab09aeb668533c87ec684e350b6e9aba)
diff --git a/tests/framework/base/windowmanager/src/android/server/wm/PinnedStackTests.java b/tests/framework/base/windowmanager/src/android/server/wm/PinnedStackTests.java
index 3ac15bb..593fefb 100644
--- a/tests/framework/base/windowmanager/src/android/server/wm/PinnedStackTests.java
+++ b/tests/framework/base/windowmanager/src/android/server/wm/PinnedStackTests.java
@@ -972,7 +972,7 @@
     @Test
     public void testSetRequestedOrientationWhilePinned() throws Exception {
         // Launch the PiP activity fixed as portrait, and enter picture-in-picture
-        launchActivity(PIP_ACTIVITY,
+        launchActivity(PIP_ACTIVITY, WINDOWING_MODE_FULLSCREEN,
                 EXTRA_PIP_ORIENTATION, String.valueOf(ORIENTATION_PORTRAIT),
                 EXTRA_ENTER_PIP, "true");
         waitForEnterPip(PIP_ACTIVITY);