调整UI到BottomCanvas下，但是MainUI还需要保留，用来显示受击伤害文字

wangguan

2020-11-14 7f71e2c1cfb5a5bd329c87249c4da4f7f8cde330

 Assets/Scripts/TowerDefense/UI/EndlessTowerGridOpen.cs

@@ -77,6 +77,7 @@

            if (bsucc)
            {
                ++GameConfig.EndlessOpenAttackTowerCount;
                towerGrid.updateGridOpenCoin(gridX, gridY);
                if (mImage)
                    mImage.color = new Color(1.0f, 1.0f, 1.0f, 0.0f);