fix user message time

app/src/main/java/info/nightscout/androidaps/plugins/general/overview/notifications/NotificationUserMessage.kt

@@ -6,6 +6,7 @@ class NotificationUserMessage  (text :String): Notification() {
         var hash = text.hashCode()
         if (hash < USERMESSAGE) hash += USERMESSAGE
         id = hash
+        date = System.currentTimeMillis()
         this.text = text
         level = URGENT
     }