fix: Fix bug in logic on listing 5.20

IntelliTect / EssentialCSharp

This project contains the source code for the book Essential C# by Mark Michaelis (Addison-Wesley).

https://essentialcsharp.com/

MIT License

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Closed BenjaminMichaelis closed 6 months ago

BenjaminMichaelis commented 6 months ago

Fixes #728

By happenstance of default value being 0 and that being the value of Black, test was passing. Changed to yellow to make it clear that this failed