Save bgscan parameter into configuration file

Signed-off-by: Ed Wildgoose <lists@wildgooses.com>
intended-for: hostap-1

wpa_supplicant/config_file.c

@@ -592,6 +592,7 @@ static void wpa_config_write_network(FILE *f, struct wpa_ssid *ssid)
 	write_pairwise(f, ssid);
 	write_group(f, ssid);
 	write_auth_alg(f, ssid);
+	STR(bgscan);
 #ifdef IEEE8021X_EAPOL
 	write_eap(f, ssid);
 	STR(identity);