fix(vm): Don't add an extra efi_disk entry

[qazbnm456]

When I tried to clone from a template with the default bios setting (seabios), there should be no efi_disk in the config. However, the post body would contain an extra efi_disk due to these lines (from DefaultFunc).

I believed this issue was like #223.

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Relates OR Closes #0000

[bpg]

Hey @qazbnm456 👋🏼 Thanks for the PR!
I think those defaults are needed for other use cases though. I don't remember details at the moment, but will run some tests later this week and get back to you.

[bpg]

Well, the issue I was thinking about was related to adding new fields to a resource without adding corresponding keys to the defaults map. Removing defaults map entirely seems fine in this case, so LGTM!

Thanks for the PR @qazbnm456!