grub2|loopback: overwrite default files with user ones

...rather than choosing between the default set and a user provided set

 1. ensures backwards compatibility after we switch from generation of
    certain content to that content being in pre-prepared config files,
    and thus no longer writing that config out to existing files.
 2. means that user configs do not have to carry copies of all files; they
    just carry the ones they want to replace (or add).

Gbp-Dch: Short

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