Install .nix-channels and nix.conf with 644 instead of 664

[cole-h]

Motivation

As far as I can tell, there's no real reason either of these need to be 664. I'm willing to bet they were just a typo that has lasted for 7 years. While this shouldn't change anything, this is, IMHO, more correct, so let's stop perpetuating the wrong mode!

NB: We just made this same change in our nix-installer: DeterminateSystems/nix-installer#1316

Context

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[Mic92]

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[Mic92]

@mergify rebase

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rebase

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