fix record wav format

lib/record/s3.js

@@ -59,7 +59,7 @@ async function upload(logger, socket) {
 
           /**encoder */
           let encoder;
-          if (obj.output_format === 'wav') {
+          if (account[0].record_format === 'wav') {
             encoder = new wav.Writer({ channels: 2, sampleRate, bitDepth: 16 });
           } else {
             // default is mp3