Remove redundant code in checkpoint conversion script

[rasbt]

Remove some unused code in the HF conversion code to estimate file sizes

[Andrei-Aksionov]

There are other 2 comments in the #1534 that I've left.

[rasbt]

Thanks @Andrei-Aksionov, I saw one and added it, and the other one was the following?

Maybe we could just retrieve the number of layers from the config file, monitor when the conversion script started working on another layer and use this as a signal to update the progress bar?

I like that idea and actually also attempted it, but in practice it would be a bit trickier and require more restructuring. Given that there are so many other important things to add to and improve in LitGPT, I thought it wouldn't be worth going down this rabbit hole now. The file-size based approach seems to get the job done well for now, what do you think?

[Andrei-Aksionov]

I like how you implemented it, so no need to do any changes.

[rasbt]

Great, thanks 😊