WPS: Do not set auth_alg=OPEN for PSK+SAE case

WPS: Do not set auth_alg=OPEN for PSK+SAE case

When wps_cred_add_sae=1 is used, WPS_AUTH_WPA2PSK credential gets
converted to enabling both PSK and SAE AKMs. However, this case was
still hardcoded auth_alg=OPEN which is not really correct for SAE. While
the SME-in-wpa_supplicant case can handle that, the SME-in-driver case
might not. Remove the unnecessary auth_alg=OPEN configuration to get the
normal PSK+SAE configuration enabled for the network profile.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>