dbus: Do not quote scan_freq and freq_list in dbus_old_handlers.c

scan_freq and freq_list are not parsed correctly by
wpa_config_parse_int_array() if quoted.

Patch for dbus_old_handlers.c, the same change as done by Robert Shade
<robert.shade@gmail.com> for dbus_new_handlers.c in commit
99276998fa26d4299825eeafb6386fe1c51f6287 ('dbus: Do not quote scan_freq
and freq_list').

Signed-off-by: Jiří Klimeš <jklimes@redhat.com>

wpa_supplicant/dbus/dbus_old_handlers.c

@@ -812,7 +812,7 @@ out:
 static const char * const dont_quote[] = {
 	"key_mgmt", "proto", "pairwise", "auth_alg", "group", "eap",
 	"opensc_engine_path", "pkcs11_engine_path", "pkcs11_module_path",
-	"bssid", NULL
+	"bssid", "scan_freq", "freq_list", NULL
 };