auth_diameter: replace STR_PARAM with PARAM_STRING

modules/auth_diameter/auth_diameter.c

@@ -89,7 +89,7 @@ static cmd_export_t cmds[] = {
  * Exported parameters
  */
 static param_export_t params[] = {
-	{"diameter_client_host", STR_PARAM, &diameter_client_host},
+	{"diameter_client_host", PARAM_STRING, &diameter_client_host},
 	{"diameter_client_port", INT_PARAM, &diameter_client_port},
 	{"use_domain", INT_PARAM, &use_domain},
 	{0, 0, 0}