fixed fetch new alarm data in realtime

ui-ngx/src/app/core/api/alarm-data-subscription.ts

@@ -128,9 +128,6 @@ export class AlarmDataSubscription {
         this.alarmDataCommand.query.pageLink.startTs = this.subsTw.fixedWindow.startTimeMs;
         this.alarmDataCommand.query.pageLink.endTs = this.subsTw.fixedWindow.endTimeMs;
       } else {
-        if (this.subsTw.startTs) {
-          this.alarmDataCommand.query.pageLink.startTs = this.subsTw.startTs;
-        }
         this.alarmDataCommand.query.pageLink.timeWindow = this.subsTw.realtimeWindowMs;
       }