WPS: Do not indicate incorrect PBC overlap based on partner link

WPS: Do not indicate incorrect PBC overlap based on partner link

The check for PBC overlap on a partner link should not be done unless
the current interface is actually in active PBC mode. Furthermore, the
wpa_s->wps_overlap variable needs to be cleared in additional places to
avoid leaving it set indefinitely.

This was found with the following test case sequence:
dbus_wps_pbc_overlap dbus_p2p_two_groups

Fixes: b43e19f3f369 ("WPS: Cross band overlap detection with multiple interfaces")
Signed-off-by: Jouni Malinen <quic_jouni@quicinc.com>