and check the right parameter while yo'ure at it

enhanced-file-server.go

@@ -70,7 +70,7 @@ func dirList(w http.ResponseWriter, r *http.Request, f http.File) {
 		key = k[0]
 	}
 	order := ""
-	o, ok := r.URL.Query()["key"]
+	o, ok := r.URL.Query()["order"]
 	if !ok || (o[0] != "asc" && o[0] != "desc") {
 		order = "asc"
 	} else {