gsupplicant: Return max SSIDs to scan given by wpa_supplicant

gsupplicant: Return max SSIDs to scan given by wpa_supplicant

Although it seems wpa_supplicant can handle 4 SSIDs in version 0.7.x
and 16 starting with 0.8.x, in practise this does not work. Return the
value reported without relying on wpa_supplicant internals to handle
the situation. In order for hidden scans to work properly, the minimum
value needs to be 1.