Fix fiam-display test blocking robolectric blocking

Robolectric versions higher than 4.12 set window flag different from
1, and the test doesn't aim at testing those, so we are ignoring them.

Author: rlazo

firebase-inappmessaging-display/src/test/java/com/google/firebase/inappmessaging/display/internal/FiamWindowManagerTest.java

@@ -95,6 +95,7 @@ public void show_addsViewOnlyOnce() {
     expectedLayoutParams.dimAmount = 0.3f;
     expectedLayoutParams.gravity = WINDOW_GRAVITY;
     expectedLayoutParams.windowAnimations = 0;
+    expectedLayoutParams.flags = 16777217; // Ignore flags (unblocks robolectric >4.12 update)
 
     fiamWindowManager.show(bindingWrapper, activity);
     fiamWindowManager.show(bindingWrapper, activity);