Windows: afslogon !KA_USERAUTH_AUTHENT_LOGON

Patchset 305133cde60fec7fb1050caf60a4319cdcf88a27 halted the practice
of calling ka_UserAuthenticateGeneral2() with the alternate smbName.
It should have halted the practice of passing flag
KA_USERAUTH_AUTHENT_LOGON which indicates that the smbName parameter
has been provided.   Passing KA_USERAUTH_AUTHENT_LOGON without the smbName
field results in a KTC_INVAL error.

This error only impacts sites that still use kaserver or Kerberos v4 for
authentication.

Change-Id: I9eb7adc4fdb7b3ffa0aedca377e2f91bc01b30ea
Reviewed-on: http://gerrit.openafs.org/9318
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>