Finish() should update state.currentBytes

[black-night-heron]

The current implementation of the Finish() function sets currentNum and invokes Add(0). While this correctly updates currentNum, it does not correctly update currentBytes. As a result, if OptionShowBytes, OptionShowIts, or OptionShowCount() options are enabled, the displayed counts or iterations will reflect incomplete values after calling Finish().

For example, consider the following Go code snippet:

package main

import (
	"time"
	"github.com/schollz/progressbar/v3"
)

func main() {
	bar := progressbar.NewOptions64(100, progressbar.OptionShowBytes(true), progressbar.OptionShowIts(), progressbar.OptionShowCount())
	bar.Add(50)
	time.Sleep(1 * time.Second)
	bar.Finish()
}

This code results in the following output:

100% |████████████████████████████████████████| (50/100 B, 50 B/s, 50 it/s)

However, the expected output should reflect the completion of the progress bar:

100% |████████████████████████████████████████| (100/100 B, 100 B/s, 100 it/s)

[schollz]

thanks for this fix!