修正IDL生成使用枚举对象时，开启debug模式，无法正常打印生成的代码

[jhunters]

@Test
public void testDefaultValue() {
    
    String idl = "package tutorial;" +
        "option java_package = \"com.example.tutorial\";" +
        "option java_outer_classname = \"AddressBookProtos\";" +
        "enum PhoneType { MOBILE = 0; HOME = 1; WORK = 2;}" +
        " message PhoneNumberAA {" +
            "optional PhoneType type = 1 [default = HOME]; //abc\n" +
            "optional int32 name = 2 [default = 10];" +
            "optional string vName = 3 [default = \"hello world\"];" +
      "}"; 
    
    IDLProxyObject idlProxyObject = ProtobufIDLProxy.createSingle(idl, true);
    
    Object type = idlProxyObject.get("type"); 
    
    Assert.assertEquals(type + "", "HOME");
    Assert.assertEquals(10, idlProxyObject.get("name"));
    Assert.assertEquals("hello world", idlProxyObject.get("vName"));
    
}

[jhunters]

2.4.7 已修复该问题