Do not duplicate grub.cfg in efiboot.img

Instruct the embeded grub.cfg to search for a volume with a
`/.disk/%UUID_SEARCH_FILENAME%.uuid` file and load `/EFI/BOOT/grub.cfg`
from it.

This avoid duplicating GRUB configuration files in two places (ISO 9660
and FAT) and ensures there is no confusion about which is the _correct_
configuration file.

Since nothing besides EFI binaries is copied to `efibootimg`, the
`_make_common_bootmode_grub_copy_to_efibootimg` function is removed.

Fixes #208

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