Fix visit UUID constructor

[rmanibus]

The condition in visitUUIDConstructor is always true and make it return a UUID_LEGACY regardless of the uuidConstructorName

        BsonBinarySubType subType = BsonBinarySubType.UUID_STANDARD;
        if (!"UUID".equals(uuidConstructorName) || !"GUID".equals(uuidConstructorName)) {
            subType = BsonBinarySubType.UUID_LEGACY;
        }

[jyemin]

Closed by agreement on https://jira.mongodb.org/browse/JAVA-3799