chore: further cleanup

SkipPreMusicRitual/MU3/patch_BattleUI.cs

@@ -0,0 +1,22 @@
+using MU3.Util;
+using System;
+using UnityEngine;
+
+namespace MU3;
+
+public class patch_BattleUI: BattleUI {
+    private System.Collections.IEnumerator playReadyProc(Action onFinish) {
+        if(!SystemUI.Exists) {
+            onFinish();
+            yield break;
+        }
+        SystemUI systemUI = SingletonMonoBehaviour<SystemUI>.instance;
+        float time = 1.5f;
+        while(0f < time) {
+            yield return null;
+            time -= Time.deltaTime;
+        }
+        onFinish();
+        systemUI.removeCanvas(MU3.Graphics.Const.SortOrder.UI);
+    }
+}