`doom-themes-neotree-config` gives different icons than the ones shown on screenshots

### Theme(s)

All themes (base)

### What were you expecting?

I expected it to look like in the official screenshots

### What actually happened?

Icons look like this instead:

### Steps to reproduce

Use this config on vanilla emacs:
```emacs-lisp
(use-package doom-themes
:init
(doom-themes-neotree-config)
(setq doom-themes-neotree-file-icons t)
(setq doom-themes-enable-bold t
doom-themes-enable-italic t
doom-themes-chevron-size 0.0))

(use-package neotree)
```

### Operating system

Fedora 41

### Emacs version

Emacs 29.4

### Installed commit of doom-themes

I have no idea how to get it

Start by reproducing the issue with the shown vanilla Emacs configuration on Emacs 29.4, Fedora 41, and the available doom-themes revision. Compare the resulting NeoTree icons with the official screenshots and identify whether the difference is caused by doom-themes, NeoTree, or an unspecified icon dependency; done means the cause is confirmed and the expected appearance is restored or documented.

Written by the indexing model from the issue text.