directory icon is not showing
<!-- bug reporting without issue template will be closed automatically -->

## Expected behavior, english is required

## Environment Information

ubuntu 20.04
NVIM v0.6.1
Build type: Release
LuaJIT 2.1.0-beta3
Compiled by team+vim@tracker.debian.org

Features: +acl +iconv +tui
See ":help feature-compile"

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/usr/share/nvim"

Run :checkhealth for more info



## Screenshots

![image](https://user-images.githubusercontent.com/46613910/161482850-ea2ff3b2-b5ec-435f-9796-3d3131ed8e03.png)

 