add groupless summary notif to the db so that it can be cleared

Previously we were creating the groupless summary notificaiton, but not adding it to the notification db. This meant that when OneSignal notifications were cleared the summary notification would not be cleared.

Author: emawby

OneSignalSDK/onesignal/src/main/java/com/onesignal/GenerateNotification.java

@@ -715,6 +715,8 @@ private static void createGrouplessSummaryNotification(
       String group = OneSignalNotificationManager.getGrouplessSummaryKey();
       String summaryMessage = grouplessNotifCount + " new messages";
       int summaryNotificationId = OneSignalNotificationManager.getGrouplessSummaryId();
+      OneSignalDbHelper dbHelper = OneSignalDbHelper.getInstance(currentContext);
+      createSummaryIdDatabaseEntry(dbHelper, group, summaryNotificationId);
 
       PendingIntent summaryContentIntent = intentGenerator.getNewActionPendingIntent(
           random.nextInt(),