Update WorldLinkService.cs

using System;

//

// ARF - Augmented Reality Framework (ETSI ISG ARF)

//

// Copyright 2022 ETSI

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//     http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

//

// Last change: June 2022

//

using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading.Tasks;