unecessary indent when `folder_arrows = 0`

[goolord]

also, the indent goes away as soon as you open a folder
https://asciinema.org/a/a2UFkk4HC12sXUhGj1uCWmVoD

[kyazdani42]

cannot reproduce. Looks like you are setting options too late.

[goolord]

ah, this option has to go before require('nvim-tree') now. this didn't used to be the case, this has been happening roughly since #603

[kyazdani42]

i know, i'll finish migrating options to setup once i merge the git rewrite :)