Accept STATUS_NETWORK_ERROR_OPERATION_DEFERRED when logging in

Status code [STATUS_NETWORK_ERROR_OPERATION_DEFERRED](https://developer.android.com/reference/com/google/android/gms/games/GamesClient.html#STATUS_NETWORK_ERROR_OPERATION_DEFERRED) (Constant value 5) means "A network error occurred while attempting to modify data, but the data was successfully modified locally and will be updated on the network the next time the device is able to sync."

This pull request stops the login method from failing when getting a STATUS_NETWORK_ERROR_OPERATION_DEFERRED status while trying to retrieve achievements.