Disable flaky app launch test

At the moment, when launching an app over the lock screen, the navbar flickers. During the animation it:

- appears
- disappears
- reappears

Bug: 227072573
Test: atest OpenAppNonResizeableTest
Change-Id: I17dd8f8ff70c4c12db97d6f337f1500e0ab177d0

tests/FlickerTests/src/com/android/server/wm/flicker/launch/OpenAppNonResizeableTest.kt

@@ -74,7 +74,7 @@ open class OpenAppNonResizeableTest(testSpec: FlickerTestParameter)
      * Checks that the nav bar layer starts invisible, becomes visible during unlocking animation
      * and remains visible at the end
      */
-    @Presubmit
+    @FlakyTest(bugId = 227083463)
     @Test
     fun navBarLayerVisibilityChanges() {
         testSpec.assertLayers {