(client) fix:The project can be successfully built

Client/Assets/Scripts/UI/EscUI.cs

@@ -15,7 +15,7 @@ namespace UI
 #if UNITY_EDITOR
             UnityEditor.EditorApplication.isPlaying = false; // 停止编辑器播放模式
 #else
-            Application.Quit(); // 关闭游戏
+            UnityEngine.Application.Quit(); // 关闭游戏
 #endif
         }