style

removing using directive.

Author: NoelStephensUnity

com.unity.netcode.gameobjects/Tests/Runtime/NetworkObject/NetworkObjectDestroyTests.cs

@@ -1,6 +1,5 @@
 using System.Collections;
 using System.Collections.Generic;
-using System.Linq;
 using NUnit.Framework;
 using Unity.Netcode.TestHelpers.Runtime;
 using UnityEngine;