ErrorDescription for LoginResult is null when response has description value

[leonluc-dev]

OIDC compliant endpoints can return both an error (error type) and an error_description (error message) value in the result.
4.0.0-preview of OidcClient seemingly added the error_description property to the result classes as well.

For some reason however when using LoginAsync and the authorization process returns an error_description value the ErrorDescription property of LoginResult is still null.

This issue doesn't occur when refreshing tokens. The ErrorDescription property of RefreshTokenResult does fill properly when using RefreshTokenAsync and an error with an error_description value is present in the OIDC response.

[leonluc-dev]

I've added propagation for the error_description value to the client and opened a pull request (#269)

[leastprivilege]

thanks - merged!

[github-actions]

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