progress: always perform a final render before exiting the render loop

[virtuald]

I expect that when I call Stop() that whatever the current state of any trackers will have been written to the output. However, there's currently no guarantee that the current output was written, even if Stop is called after all of my tracker updates on the same goroutine. Here's a silly example that demonstrates the point:

package main

import (
	"time"

	"github.com/jedib0t/go-pretty/v6/progress"
)

func main() {

	var prog progress.Progress
	prog.Style().Colors = progress.StyleColorsExample
	prog.Style().Options.PercentFormat = "%4.1f%%"
	go prog.Render()

	t := progress.Tracker{
		Message: "Interesting thing",
		Total:   30,
	}

	prog.AppendTracker(&t)

	for i := 0; i < 30; i++ {
		t.Increment(1)
		time.Sleep(1 * time.Millisecond)
	}

	t.MarkAsDone()

	prog.Stop()
	for {
		if !prog.IsRenderInProgress() {
			break
		}
		time.Sleep(50 * time.Millisecond)
	}

}

If you run this without this PR applied, there will never be output shown because the render never gets a chance to run.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

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[coveralls]

Pull Request Test Coverage Report for Build 1019349029

• 3 of 5 (60.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.07%) to 99.932%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
progress/render.go	3	5	60.0%

Totals
Change from base Build 1009327820:	-0.07%
Covered Lines:	2945
Relevant Lines:	2947

---

💛 - Coveralls

[jedib0t]

Tagged: https://github.com/jedib0t/go-pretty/releases/tag/v6.2.4