add ack by to edge case to ensure tooltip is up to date

meteor/app/client/alertsummary.js

@@ -236,7 +236,8 @@ if (Meteor.isClient) {
                                             summary:1,
                                             severity:1,
                                             category:1,
-                                            acknowledged:1
+                                            acknowledged:1,
+                                            acknowledgedby:1
                                             },
                                     sort: {utcepoch: -1},
                                     limit: Session.get('alertsrecordlimit'),