hotfix(operator): assign SubscribeToNewTasksV3() correctly

[JuArce]

Description

In operator/pkg/operator.go the SubscribeToNewTasksV3() is being assigned to subV2

		case err := <-subV3:
			o.Logger.Infof("Error in websocket subscription", "err", err)
			subV2, err = o.SubscribeToNewTasksV3()
			if err != nil {
				o.Logger.Fatal("Could not subscribe to new tasks V3")
			}