Add DelayAfterEnd Default Value

Data/RenderConfig.cs

@@ -17,7 +17,7 @@ public class RenderConfig
     public AudioEncodingConfig AudioConfig { get; set; } = new();
     public AdvancedConfig AdvancedConfig { get; set; } = new();
 
-    public double DelayAfterEnd { get; set; }
+    public double DelayAfterEnd { get; set; } = 15;
     public bool ShowJudgementText { get; set; } = false;
 }