db_cluster: replace STR_PARAM with PARAM_STRING

modules/db_cluster/db_cluster_mod.c

@@ -51,8 +51,8 @@ static cmd_export_t cmds[] = {
  * Exported parameters
  */
 static param_export_t params[] = {
-	{"connection",  STR_PARAM|USE_FUNC_PARAM, (void*)dbcl_con_param},
-	{"cluster",     STR_PARAM|USE_FUNC_PARAM, (void*)dbcl_cls_param},
+	{"connection",  PARAM_STRING|USE_FUNC_PARAM, (void*)dbcl_con_param},
+	{"cluster",     PARAM_STRING|USE_FUNC_PARAM, (void*)dbcl_cls_param},
 	{"inactive_interval",     INT_PARAM,    &dbcl_inactive_interval},
 	{"max_query_length",     INT_PARAM,    &dbcl_max_query_length},
 	{0, 0, 0}