dotnet fix

Author: EmandM

com.unity.netcode.gameobjects/Tests/Editor/NetworkBehaviourEditorTests.cs

@@ -1,8 +1,5 @@
-using System.Collections;
 using NUnit.Framework;
-using Unity.Netcode.TestHelpers.Runtime;
 using UnityEngine;
-using UnityEngine.TestTools;
 using Object = UnityEngine.Object;
 
 namespace Unity.Netcode.EditorTests