Cancel all should also trigger hourkeeping

Author: aurimasc

com.unity.mobile.notifications/Runtime/Android/Plugins/com/unity/androidnotifications/UnityNotificationManager.java

@@ -603,6 +603,7 @@ public void cancelAllPendingNotificationIntents() {
                     cancelPendingNotificationIntent(context, Integer.valueOf(id));
                     deleteExpiredNotificationIntent(context, id);
                 }
+                triggerHousekeeping(context, null);
             }).start();
         }
     }