Update NoMADUser.swift to normalize usernames to lowercase.
Currently, the localPasswordSyncOnMatchOnly setting only works if the AD user and local user match case. (User1 and User1 will sync, but User1 and user1 will not).
Currently, the localPasswordSyncOnMatchOnly setting only works if the AD user and local user match case. (User1 and User1 will sync, but User1 and user1 will not).