fix: avoid append zero suffix on exporting user data

Signed-off-by: Max Wu <jackymaxj@gmail.com>

Author: jackycute

lib/user/index.js

@@ -91,8 +91,11 @@ exports.exportMyData = (req, res) => {
         let filename
         let suffix = 0
         do {
-          const separator = suffix === 0 ? '' : '-'
-          filename = basename + separator + suffix + '.md'
+          if (suffix === 0) {
+            filename = basename + '.md'
+          } else {
+            filename = basename + '-' + suffix + '.md'
+          }
           suffix++
         } while (filenames[filename])
         filenames[filename] = true