[Bug]: EnumMember type as a clientDefaultValue?

[qiaozha]

Describe the bug

for the given typespec,

    @server(
      "{endpoint}/client/structure/{client}",
      "",
      {
        @doc("Need to be set as 'http://localhost:3000' in client.")
        endpoint: url,
    
        @doc("Need to be set as 'default', 'multi-client', 'renamed-operation', 'two-operation-group' in client.")
        client: ClientType = ClientType.Default,
      }
    )

the clientDefaultValue we get for client parameter is a type instead of a value, however if it's a constant, we will just get a value for clientDefaultValue.

I feel like we should always extract the value for clientDefaultValue?

Reproduction

N/A

Checklist

• Follow our Code of Conduct
• Check that this issue is about the Azure libraries for typespec. For bug in the typespec language or core libraries file it in the TypeSpec repo
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• The provided reproduction is a minimal reproducible example of the bug.