Remove incorrect call to Window.addFlags with a system flag

The same flag is being (correctly) added in onCreate, so on top of being wrong this was also completely unnecessary.

Bug: 368579654
Test: manual
Flag: EXEMPT bugfix

Change-Id: I539fca77a1d136bdd0e4892993020884430b8a4e
Merged-In: I539fca77a1d136bdd0e4892993020884430b8a4e
(cherry picked from commit e0510a62eb)

src/com/android/settings/notification/NotificationAccessConfirmationActivity.java

@@ -42,7 +42,6 @@ import android.os.UserManager;
 import android.service.notification.NotificationListenerService;
 import android.text.TextUtils;
 import android.util.Slog;
-import android.view.WindowManager;
 import android.view.accessibility.AccessibilityEvent;
 import android.widget.Toast;
 
@@ -160,20 +159,6 @@ public class NotificationAccessConfirmationActivity extends Activity
         getWindow().setCloseOnTouchOutside(false); 
     }
 
-    @Override
-    public void onResume() {
-        super.onResume();
-        getWindow().addFlags(
-                WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS);
-    }
-
-    @Override
-    public void onPause() {
-        getWindow().clearFlags(
-                WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS);
-        super.onPause();
-    }
-
     private void onAllow() {
         mNm.setNotificationListenerAccessGranted(mComponentName, true);