fix: 多级弹窗窗体内滚动

Author: ArgoZhang

src/BootstrapBlazor/Components/Dialog/Dialog.razor.cs

@@ -166,6 +166,11 @@ private async Task Show(DialogOption option)
 
     private static RenderFragment RenderDialog(int index, Dictionary<string, object> parameter) => builder =>
     {
+        if (index > 0)
+        {
+            parameter[nameof(ModalDialog.IsScrolling)] = true;
+        }
+
         builder.OpenComponent<ModalDialog>(100 + index);
         builder.AddMultipleAttributes(101 + index, parameter);
         builder.SetKey(parameter);