Modify a HOCON file

[ahhyeonny]

Version Information
Version of Akka.NET?
Which Akka.NET Modules?
Akka 1.5.1

Describe the bug
If you save it as shown above, it will be saved in JSON format as follows:

abc : {
    test : {
      aaa : 2.22.2.1
      abscd : 9131
      aaabbb : on
    }
  }

The desired format is as follows:

abc.test
{
  aaa  =  2.22.2.1
  abscd  =  9131
  aaabbb = on
}

When I modify a HOCON file, I want to save it with the original format and only change the values.

To Reproduce
Steps to reproduce the behavior:

using Akka.Configuration;
using System.IO;

namespace HoconTest
{
    public class Program
    {
        static void Main(string[] args)
        {
            var hocon = @"abc.test
{
  aaa  =  2.22.2.1
  abscd  =  9131
  aaabbb = on
}";
            var config = ConfigurationFactory.ParseString(hocon);
            var hoconPath = "C:\\Workspace\\Test\\test.hocon";

            var logLevel = "DEBUG";
            config = config.WithFallback(ConfigurationFactory.ParseString($"akka.cluster.collector.user = {logLevel}"));

            config = ConfigurationFactory.ParseString($"akka.cluster.collector.user = {logLevel}").WithFallback(config);
            File.WriteAllText(hoconPath, config.Root.ToString());

        }
    }
}

It is a console program simply designed to check the saved file.

Expected behavior
A clear and concise description of what you expected to happen.

Actual behavior
What actually happened and how did it differ from your expectations?

Screenshots
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Environment
Are you running on Linux? Windows? Docker? Which version of .NET?
Windows, .NET Framework 4.7

Additional context
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