advapi32: Fix output of GetUserNameW when joined to a domain. (try 2)

[Kai Blin]

On a Windows box joined to a domain, GetUserName will not return the domain
part. On a Unix box joined to a domain via winbindd, wine_get_user_name will.
So we need to cut off the domain instead of just replacing the \ character.
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 dlls/advapi32/advapi.c |   17 ++++++++++++++++-
 1 files changed, 16 insertions(+), 1 deletions(-)
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