无尽模式加了法阵和掉落的特效，改了场景canvas渲染模式

chenxin

2020-10-24 2fc3753ac9c591a01f0d966984abe659113fe57f

 Assets/Scripts/TowerDefense/Level/EndlessLevelManager.cs

@@ -371,6 +371,7 @@
        /// </summary>
        private void BeginLevel()
        {
            if (EndlessGameUI.instance.state == EndlessGameUI.State.GameOver) return;
            ShowSelectBuffUI();
        }

@@ -463,6 +464,7 @@
        /// </summary>
        protected virtual void SafelyCallLevelCompleted()
        {
            EndlessDropManager.instance.PickUpAllDrop();
            if (LevelCompleted != null)
                LevelCompleted();
        }