That file looks fine at a quick glance.
To check if the problem is caused by removing package grub2-theme-endeavouros, you can install it with command
sudo pacman -U /var/cache/pacman/pkg/grub2-theme-endeavouros-20220602-1-any.pkg.tar.zst
if you have it there in the package cache.
If you don’t have it, I can show you where to get it.