Darker bg_dark for night style

[jmederosalvarado]

Hi. First of all thank you for this theme and all the other plugins you maintain, they are all great.

I have been using this theme for a few days now and I have noticed that with the night version the background of the NvimTree is lighter than the background of the editor, maybe this is by design. I'm opening this issue, because it was the first thing that I noticed when switching to this theme, and because in the vscode version of the theme this is not the way it looks.

I've been looking at the code and I've noticed that bg_dark in the palette is not changed when using the night version. Is this the way it's supposed to be ?.

This is how it looks for me:

This is how it looks for the vscode version, according to the readme on their repo:

[ourigen]

I would also like a darker NvimTree for the night style. A temporary fix is you can override the color by

vim.g.tokyonight_colors = {
	bg_sidebar = '<color group>',
}