Core: remove [identifier type] from ToString as mentioning [dns] confuses users.

Author: webprofusion-chrisc

src/Certify.Models/Config/CertIdentifierItem.cs

@@ -16,7 +16,7 @@ public class CertIdentifierItem
 
         public override string ToString()
         {
-            return $"{Value} [{IdentifierType}]";
+            return $"{Value}";
         }
 
         public CertIdentifierItem() { }