style(web): simplify tdb_query() func

web/public/js/tfm-database.js

@@ -5,7 +5,7 @@ if (db_name == null) {
 
 $(document).on("click", "#btn-save", function (e) {
 	e.preventDefault();
-	let resp = tdb_query(db_name, 4, "");
+	let resp = tdb_query(db_name, 4);
 	if (resp.status) {
 		alert("Successfully saved!");
 	} else {
@@ -18,7 +18,7 @@ $(document).on("click", "#btn-discard", function (e) {
 	if (!confirm("All unsaved changes will be lost permanently. Are you sure?")) {
 		return;
 	}
-	let resp = tdb_query(db_name, 2, "");
+	let resp = tdb_query(db_name, 2);
 	if (resp.status) {
 		alert("Successfully reloaded database!");
 	} else {