Fix issue 1153 on expanded tree

[davide-pi]

Description

Fix issue #1153

Examples

Before fix	After fix

To Test

To test the fix the following code was used.
Is sufficient to put it into the Main method of the Program.cs in the Spectre.Console.Analyzer.Sandbox to see the difference between expanded and not expanded trees.

NOTE: Curly brackets are used to simplify code duplication for test purposes only

      {
            AnsiConsole.MarkupLine("Expaded [green]default true[/]");
            var root = new Tree("root");
            root.AddNode("node1");
            root.AddNode("node2");
            AnsiConsole.Render(root);
        }

        AnsiConsole.MarkupLine("");
        AnsiConsole.MarkupLine("");

        {
            AnsiConsole.MarkupLine("Expaded [red]false[/] in init");
            var root = new Tree("root") { Expanded = false };
            root.AddNode("node1");
            root.AddNode("node2");
            AnsiConsole.Render(root);
        }
        AnsiConsole.MarkupLine("");
        {
            AnsiConsole.MarkupLine("Expaded [green]true[/] in init");
            var root = new Tree("root") { Expanded = true };
            root.AddNode("node1");
            root.AddNode("node2");
            AnsiConsole.Render(root);
        }

        AnsiConsole.MarkupLine("");
        AnsiConsole.MarkupLine("");

        {
            AnsiConsole.MarkupLine("Expaded [red]false[/] after init");
            var root = new Tree("root");
            root.Expanded = false;
            root.AddNode("node1");
            root.AddNode("node2");
            AnsiConsole.Render(root);
        }
        AnsiConsole.MarkupLine("");
        {
            AnsiConsole.MarkupLine("Expaded [green]true[/] after init");
            var root = new Tree("root");
            root.Expanded = true;
            root.AddNode("node1");
            root.AddNode("node2");
            AnsiConsole.Render(root);
        }

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[davide-pi]

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