common: Restore /boot/efi/EFI/fedora/grub.cfg

[JGoutin]

We should avoid modifying this file directly: https://fedoraproject.org/wiki/GRUB_2#Updating_the_GRUB_configuration_file

Solution:

• https://fedoraproject.org/wiki/GRUB_2#Reinstalling_GRUB
• https://docs.fedoraproject.org/en-US/fedora/latest/system-administrators-guide/kernel-module-driver-configuration/Working_with_the_GRUB_2_Boot_Loader/#sec-grub2-reinstall_on_UEFI-Based_Machines