FIDO2 domain comparison in 'authenticate_begin'

[maximbelyayev]

Similar to #70:

I have created a FIDO2 passkey, which is saved to Bitwarden and key properties stored in multifactor_userkey table.

When posting to /mfa/multifactor/fido2/begin-auth/, authenticate_begin calls get_user_credentials, which attempts to find UserKey object with properties__domain equal to request.get_host().

I don't know if this is an issue specific to Bitwarden, but the saved FIDO2 key has properties__domain equal to localhost. When working with localhost, the request.get_host() will return the port as well: localhost:8000. This causes a mismatch that doesn't return an AttestedCredentialData object, and Bitwarden states "No passkeys found for this application."

Simply changing the line to properties__domain=request.get_host().split(":")[0] solves the issue and Bitwarden can now find the passkey.