Fixed children not drawing other children

[Bozhidar-A]

This pull request is in response to issue #71

In ProgressBar.cs the DrawChildren() function was called only if ProgressBarOnBottom was set to false.

if (child.Options.ProgressBarOnBottom)
    {
     ProgressBarBottomHalf(percentage, child.StartDate, child.EndTime, child.Message, childIndentation,
      child.Options.ProgressBarOnBottom, child.Options.ShowEstimatedDuration,
      child.EstimatedDuration);
     Console.SetCursorPosition(0, ++cursorTop);
     TopHalf();
    }
else
    {
     TopHalf();
     Console.SetCursorPosition(0, ++cursorTop);
     ProgressBarBottomHalf(percentage, child.StartDate, child.EndTime, child.Message, childIndentation,
      child.Options.ProgressBarOnBottom, child.Options.ShowEstimatedDuration,
      child.EstimatedDuration);

     DrawChildren(child.Children, childIndentation, ref cursorTop);
    }

This made children unable to draw children

I moved the DrawChildren() call after the if(). This fixed the issue.