Fix TOTP input field not being shown when enabled

[DL6ER]

What does this implement/fix?

See title, the issue is that 401 Unauthorized is not handled in .done() but in .fail()

Related issue or feature (if applicable): N/A

Pull request in docs with documentation (if applicable): N/A

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[yubiuser]

According to the documentation, there is no 401 but only 200 return code. Is this a flaw in the documentation?

[DL6ER]

Thanks, fixed by pi-hole/FTL#1700