[fix] 解决7c0579b4bbd7d2c746a8a264d54557ec1e209fd4提交造成的编译错误 (#55)

Co-authored-by: 宝鱼 <kteong1012@outlook.com>

src/Luban.Job.Cfg/Source/DataVisitors/ToLiteralVisitorBase.cs

@@ -7,7 +7,7 @@ namespace Luban.Job.Cfg.DataVisitors
 {
     abstract class ToLiteralVisitorBase : IDataFuncVisitor<string>
     {
-        public string Accept(DBool type)
+        public virtual string Accept(DBool type)
         {
             return type.Value ? "true" : "false";
         }