Update log level for warning

To indicate that a presentation stats event has already been logged and
should not be logged again, we'll log a warning instead wtf since
it's a noop.

Change-Id: I7c8c8efb47e8ad02eeca87c86aac3e482beb375a
Fixes: 235753428
Test: Tested on device

services/autofill/java/com/android/server/autofill/PresentationStatsEventLogger.java

@@ -174,7 +174,7 @@ public final class PresentationStatsEventLogger {
 
     public void logAndEndEvent() {
         if (!mEventInternal.isPresent()) {
-            Slog.wtf(null, "Shouldn't be logging AutofillPresentationEventReported again for same "
+            Slog.w(TAG, "Shouldn't be logging AutofillPresentationEventReported again for same "
                     + "event");
             return;
         }