charon-nm: Correctly set remote auth class for PSK authentication

Fixes: bc3eda99ba ("charon-nm: Add support for EAP-TLS")

src/charon-nm/nm/nm_service.c

@@ -605,7 +605,6 @@ static gboolean connect_(NMVpnServicePlugin *plugin, NMConnection *connection,
 	traffic_selector_t *ts;
 	ike_sa_t *ike_sa;
 	auth_cfg_t *auth;
-	auth_class_t auth_class = AUTH_CLASS_EAP;
 	certificate_t *cert = NULL;
 	x509_t *x509;
 	bool loose_gateway_id = FALSE;
@@ -799,7 +798,7 @@ static gboolean connect_(NMVpnServicePlugin *plugin, NMConnection *connection,
 	}
 
 	auth = auth_cfg_create();
-	if (auth_class == AUTH_CLASS_PSK)
+	if (streq(method, "psk"))
 	{
 		auth->add(auth, AUTH_RULE_AUTH_CLASS, AUTH_CLASS_PSK);
 	}