Using centered figlet in rows throws

[EluciusFTW]

Information

• OS: Windows 10
• Version: 0.46
• Terminal: Windows Terminal

Describe the bug
Using a centered figlet inside of rows leads to an exception, when there is another 'small element' present.

To Reproduce
Here is a minimal console app to reproduce the bug:

using Spectre.Console;

var rows = new Rows(
    new Markup("Short"), // omitting this markup altogether or making the string leads to no exception
    new FigletText("Some other string").Centered()); // using left- or right-justified leads to no exception in any case
var panel = new Panel(rows);
AnsiConsole.Write(panel);

Note: Either removing the first IRenderable, or making its content bigger by passign a longer string will make it not throw.

Here's the StackTrace:

Unhandled exception. System.ArgumentOutOfRangeException: Count cannot be less than zero. (Parameter 'count')
   at System.String.Ctor(Char c, Int32 count)
   at Spectre.Console.Rendering.Segment.Padding(Int32 size) in /_/src/Spectre.Console/Rendering/Segment.cs:line 53
   at Spectre.Console.FigletText.Render(RenderOptions options, Int32 maxWidth)+MoveNext() in /_/src/Spectre.Console/Widgets/Figlet/Figl
etText.cs:line 73
   at Spectre.Console.EnumerableExtensions.Enumerate[T](IEnumerator`1 source)+MoveNext() in /_/src/Spectre.Console/Internal/Extensions/
EnumerableExtensions.cs:line 102
   at Spectre.Console.Rows.Render(RenderOptions options, Int32 maxWidth) in /_/src/Spectre.Console/Widgets/Rows.cs:line 55
   at Spectre.Console.Rendering.Renderable.Spectre.Console.Rendering.IRenderable.Render(RenderOptions options, Int32 maxWidth) in /_/sr
c/Spectre.Console/Rendering/Renderable.cs:line 19
   at Spectre.Console.Padder.Render(RenderOptions options, Int32 maxWidth) in /_/src/Spectre.Console/Widgets/Padder.cs:line 69
   at Spectre.Console.Rendering.Renderable.Spectre.Console.Rendering.IRenderable.Render(RenderOptions options, Int32 maxWidth) in /_/sr
c/Spectre.Console/Rendering/Renderable.cs:line 19
   at Spectre.Console.Panel.Render(RenderOptions options, Int32 maxWidth) in /_/src/Spectre.Console/Widgets/Panel.cs:line 137
   at Spectre.Console.Rendering.Renderable.Spectre.Console.Rendering.IRenderable.Render(RenderOptions options, Int32 maxWidth) in /_/sr
c/Spectre.Console/Rendering/Renderable.cs:line 19
   at Spectre.Console.RenderableExtensions.GetSegments(IAnsiConsole console, RenderOptions options, IEnumerable`1 renderables) in /_/sr
c/Spectre.Console/Extensions/RenderableExtensions.cs:line 37
   at Spectre.Console.RenderableExtensions.GetSegments(IRenderable renderable, IAnsiConsole console) in /_/src/Spectre.Console/Extensio
ns/RenderableExtensions.cs:line 29
   at Spectre.Console.AnsiBuilder.Build(IAnsiConsole console, IRenderable renderable) in /_/src/Spectre.Console/Internal/Backends/Ansi/
AnsiBuilder.cs:line 17
   at Spectre.Console.AnsiConsoleBackend.Write(IRenderable renderable) in /_/src/Spectre.Console/Internal/Backends/Ansi/AnsiConsoleBack
end.cs:line 30
   at Spectre.Console.AnsiConsoleFacade.Write(IRenderable renderable) in /_/src/Spectre.Console/Internal/Backends/AnsiConsoleFacade.cs:
line 40
   at Spectre.Console.AnsiConsole.Write(IRenderable renderable) in /_/src/Spectre.Console/AnsiConsole.Rendering.cs:line 29
   at Program.<Main>$(String[] args) in C:\Repos\SpectrePanelBug\SpectrePanelBug\Program.cs:line 7

Expected behavior
As I can pass a collection of IRenderables into Rows, I'd expect it not to throw under any such circumstance.

Screenshots
If applicable, add screenshots to help explain your problem.

[patriksvensson]

Closed via #1302