NotificationListenerServiceTest: Mark unaudited PendingIntents with FLAG_MUTABLE_UNAUDITED

These PIs need an explicit mutability flag. This temporay flag is being
used to mark these points in code and should be replaced ASAP.
See go/immutable-pendingintents for more context.

Bug: 160794467
Test: TH
Exempt-From-Owner-Approval: noop change
Change-Id: I69f27c2daf8ece7331c47ce255368e6222143bf1

services/tests/uiservicestests/src/com/android/server/notification/NotificationListenerServiceTest.java

@@ -357,11 +357,13 @@ public class NotificationListenerServiceTest extends UiServiceTestCase {
     private ArrayList<Notification.Action> getSmartActions(String key, int index) {
         ArrayList<Notification.Action> actions = new ArrayList<>();
         for (int i = 0; i < index; i++) {
+            // TODO(b/174935955) Please replace FLAG_MUTABLE_UNAUDITED below
+            // with either FLAG_IMMUTABLE (recommended) or FLAG_MUTABLE.
             PendingIntent intent = PendingIntent.getBroadcast(
                     getContext(),
                     index /*requestCode*/,
                     new Intent("ACTION_" + key),
-                    0 /*flags*/);
+                    PendingIntent.FLAG_MUTABLE_UNAUDITED /*flags*/);
             actions.add(new Notification.Action.Builder(null /*icon*/, key, intent).build());
         }
         return actions;