add protection against requesting direct service files

zefie_wtvp_minisrv/ServiceVault/wtv-disk/sync.js

@@ -1,3 +1,5 @@
+var minisrv_service_file = true;
+
 const WTVDownloadList = require("./WTVDownloadList.js");
 var wtvdl = new WTVDownloadList(minisrv_config, service_name);