rEFInd FS driver copy typo

There's a typo in the line 596 of /lib/util-base.sh. The .fi should be .efi instead.

case $rootfs in
        nilfs2|xfs|jfs) cp /usr/share/refind/drivers_x64/"$rootfs"_x64.fi ${MOUNTPOINT}${UEFI_MOUNT}/EFI/refind/drivers_x64/
            ;;
    esac

I could probably fix that, but I would need a bit of guidance. I don't have much experience with git, and I have never used GitLab-like platforms (aside from browsing).