Add missing @Test annotation to ignoresGesture_transitionInProgress

Test: m -j
Test: atest BackAnimationControllerTest#ignoresGesture_transitionInProgress
Bug: 232793611

Merged-In: I1738b40c8df1c9af7bb0e63586cb2e70b3c9e8ca
Change-Id: I1738b40c8df1c9af7bb0e63586cb2e70b3c9e8ca

libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/back/BackAnimationControllerTest.java

@@ -254,6 +254,7 @@ public class BackAnimationControllerTest {
         verify(mIOnBackInvokedCallback, never()).onBackInvoked();
     }
 
+    @Test
     public void ignoresGesture_transitionInProgress() throws RemoteException {
         mController.setBackToLauncherCallback(mIOnBackInvokedCallback);
         RemoteAnimationTarget animationTarget = createAnimationTarget();