Pass the Admin group mod for windows/adduser payload

[jerome.athias at free.fr (Jerome Athias)]

Little change to be able to specify the name of the Administrators group 
with the windows/adduser payload (useful for non-english Windows boxes ;-))

See also:
https://www.securinfos.info/international-opcodes/windows-administrators-group-names-multi-locales.php

/JA
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