server: Fail with WSAEINVAL or WSAEALREADY when trying to connect a socket that is already connecting via nonblocking connect().

Fixes connection in Mortal Kombat 11; reported by Thomas Crider.

Fixes: a891713fSigned-off-by: Zebediah Figura <z.figura12@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>