statusline  cann't be changed according to init.toml
I set statusline sections like blow
```
[options]
    # other options
    statusline_left_sections = ["winnr"]
    statusline_right_sections = ["filename", "fileformat"]

```
But many others sections have been display in statusline, some sections are not what I want, like 
[ "major mode", "major mode",  etc... ]
<img width="1481" alt="Screen Shot 2021-07-04 at 20 19 29" src="https://user-images.githubusercontent.com/16577489/124384709-26c5bc00-dd05-11eb-92fb-8fd84b3457b9.png">

What I want is like blow, because I need more space in the middle of statusline to show bftpath.
<img width="1481" alt="Screen Shot 2021-07-04 at 20 24 29" src="https://user-images.githubusercontent.com/16577489/124384863-d8fd8380-dd05-11eb-872b-97f1227b8948.png">


