Update configure-jwt-bearer-authentication so that code matches docs

[Nothing-Works]

The docs mentioned SetDefaultPolicy so the code should match as well. https://learn.microsoft.com/en-us/aspnet/core/security/authentication/configure-jwt-bearer-authentication?view=aspnetcore-9.0#forcing-the-bearer-authentication

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aspnetcore/security/authentication/configure-jwt-bearer-authentication.md	Configure JWT bearer authentication in ASP.NET Core

[guardrex]

Thanks @Nothing-Works! 🎸

cc: @damienbod

[guardrex]

btw @damienbod ... The indentation throughout the file should get an update at some point. We use four spaces for C# code. I'm not going to edit the file, as I'm wrapping up Blazor items for the week ⛰️⛏️😅. I just wanted to let you know for perhaps a future pass on this article.

cc: @Rick-Anderson