빌드 안되는 버그 수정

Reviewed-on: http://220.90.135.190:3000/UVCXR/Studio/pulls/4

Assets/Scripts/XED/UI/Tag/UI_GUIWindow.cs

@@ -1,6 +1,5 @@
 using System.Drawing;
 using System.Security.Policy;
-using UnityEditor.SceneManagement;
 using UnityEngine;
 using UnityEngine.EventSystems;
 using UnityEngine.UI;