UI: Entity data subscription cmds prepare keys without duplicates.

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

@@ -685,7 +685,7 @@ export class EntityDataSubscription {
       if (this.tsFields.length > 0) {
         if (this.history) {
           cmd.historyCmd = {
-            keys: this.tsFields.map(key => key.key),
+            keys: [... new Set(this.tsFields.map(key => key.key))],
             startTs: this.subsTw.fixedWindow.startTimeMs,
             endTs: this.subsTw.fixedWindow.endTimeMs,
             interval: 0,
@@ -702,7 +702,7 @@ export class EntityDataSubscription {
           }
         } else {
           cmd.tsCmd = {
-            keys: this.tsFields.map(key => key.key),
+            keys: [... new Set(this.tsFields.map(key => key.key))],
             startTs: this.subsTw.startTs,
             timeWindow: this.subsTw.aggregation.timeWindow,
             interval: 0,