Bug#984759: grub2-common: grub-install/2.02+dfsg1-20+deb10u4 ignores --bootloader-id=xxx parm; sets grubx64.efi's prefix to /EFI/debian -- prevents system boot

[YW]

It would seem that *not* setting the prefix in grubx64.efi would be a
better solution as long as the current directory is the one containing
the grubx64.efi file, such that the grub.cfg is right there ready to be
processed. That would eliminate embedding a path in grubx64.efi.