Description of problem:

grub-customizer modifies `/boot/efi/EFI/fedora/grub.cfg` by default, which is a stub file since f34.[1] This causes GRUB unable to find fonts and results in more unstable behaviors.

The related source code lies in [2].

[1]: https://fedoraproject.org/wiki/GRUB_2#Updating_the_GRUB_configuration_file
[2]: https://src.fedoraproject.org/rpms/grub-customizer/blob/rawhide/f/grub-customizer.spec#_59

Version-Release number of selected component (if applicable): 

Since commit 94a1069 (https://src.fedoraproject.org/rpms/grub-customizer/c/94a1069a27b4f760936d766ca9f50946ab00eb9b) and f34

How reproducible: Always

Steps to Reproduce:
1. Install grub-customizer in a UEFI boot enabled Fedora installation
2. `cat /etc/grub-customizer/grub.cfg`
3. Try to use it to modify config and reboot

Actual results:

2. Outputs:

-----
$ cat /etc/grub-customizer/grub.cfg
MKCONFIG_CMD=grub2-mkconfig
INSTALL_CMD=grub2-install
MKFONT_CMD=grub2-mkfont
CFG_DIR=/etc/grub.d
OUTPUT_DIR=/boot/efi/EFI/fedora
OUTPUT_FILE=/boot/efi/EFI/fedora/grub.cfg
SETTINGS_FILE=/etc/default/grub
-----

3. GRUB will fail to find fonts and display only ASCII fonts. It might be just one of the unstable behaviors.

Expected results: 

-----
$ cat /etc/grub-customizer/grub.cfg
<...>
OUTPUT_DIR=/boot/grub2
OUTPUT_FILE=/boot/grub2/grub.cfg
<...>
-----

And GRUB behaves normally.

Additional info: 

Just deleting L59-62 in the rpmspec is enough to fix the problem.