Update ActivityTransitionTests for shell transit

When shell transitions are enabled we don't dump a value for lastUsedAppTransition in the proto trace so getWmState().getDefaultDisplayLastTransition() always returns TRANSIT_NONE for 0.

Just checking the app transition state should be robust enough.

Test: atest CtsWindowManagerDeviceTestCases:ActivityTransitionTests with shell transitions enabled

Bug: 233597493
Change-Id: I2330f244c6cdc95c37627bfb8acb6ef3c1aa59e1
diff --git a/tests/framework/base/windowmanager/src/android/server/wm/ActivityTransitionTests.java b/tests/framework/base/windowmanager/src/android/server/wm/ActivityTransitionTests.java
index f55cccf..cd005e5 100644
--- a/tests/framework/base/windowmanager/src/android/server/wm/ActivityTransitionTests.java
+++ b/tests/framework/base/windowmanager/src/android/server/wm/ActivityTransitionTests.java
@@ -457,9 +457,7 @@
         boolean isTransitioning;
         do {
             getWmState().computeState();
-            isTransitioning =
-                    getWmState().getDefaultDisplayLastTransition().equals("TRANSIT_ACTIVITY_OPEN")
-                    && getWmState().getDefaultDisplayAppTransitionState()
+            isTransitioning = getWmState().getDefaultDisplayAppTransitionState()
                             .equals("APP_STATE_RUNNING");
             SystemClock.sleep(10);
         } while (!isTransitioning);