fix: empty exported notes in the archive (#1942)

Author: Yukaii

lib/user/index.js

@@ -101,7 +101,7 @@ exports.exportMyData = (req, res) => {
         filenames[filename] = true
 
         logger.debug('Write: ' + filename)
-        archive.append(Buffer.from(note.content), { name: filename, date: note.lastchangeAt })
+        archive.append(note.content, { name: filename, date: note.lastchangeAt })
         callback(null, null)
       }, function (err) {
         if (err) {