Fix validation of the two factor challenge with an empty recovery code input

[sebastiansulinski]

Description

This PR together with the one I've submitted to laravel/fortify is providing the fix for the following scenario:

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While authenticating with 2FA using the code option with empty input, on submission we get the validation message:

however when doing the same using recovery code option - we do not see the error:

Steps To Reproduce

Authenticate using username and password, followed by 2FA form - first try the code and then recovery code - both times submit form with empty input.

Only code version will display validation message.

[taylorotwell]

Your component name has a spelling error?

[sebastiansulinski]

@taylorotwell - ups, didn't realise - that's now been updated and new PR submitted.