Conformance fixes for v2.

Author: aseigler

Src/Fido2.Models/Metadata/MetadataTOCPayload.cs

@@ -40,7 +40,7 @@ public class MetadataTOCPayload
         /// <summary>
         /// The "alg" property from the original JWT header. Used to validate MetadataStatements.
         /// </summary>
-        [JsonProperty("jwtAlg", Required = Required.AllowNull)]
+        [JsonProperty("jwtAlg", Required = Required.Default)]
         public string JwtAlg { get; set; }
     }
 }

Src/Fido2/Metadata/ConformanceMetadataRepository.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.IdentityModel.Tokens.Jwt;
 using System.Linq;
@@ -102,6 +102,7 @@ public async Task<MetadataTOCPayload> GetToc()
                 {
                     entries.Add(entry);
                 }
+                combinedToc.JwtAlg = toc.JwtAlg;
             }
 
             combinedToc.Entries = entries.ToArray();