Use attrsOf in place of loaOf when relevant

[ericsagnes]

Motivation for this change

loaOf types are problematic. #1800
This is a first pass to fix the options that was wrongly using loaOf in places where attrsOf was expected.

This PR content is fairly conservative, fixing loaOf options for which the attribute name was explicitly used in the implementation section (so that should have not worked fine when a list was used).

Tested by building the manual.

• acme @fpletz
• logcheck @bluescreen303
• tahoe @MostAwesomeDude
• tinc @wkennington
• znc @schneefux
• zope2 @garbas

Things done

• Tested using sandboxing
  (nix.useSandbox on NixOS,
  or option build-use-sandbox in nix.conf
  on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • Linux
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

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[mention-bot]

@ericsagnes, thanks for your PR! By analyzing the history of the files in this pull request, we identified @MostAwesomeDude, @bluescreen303 and @chexxor to be potential reviewers.

[domenkozar]

cc @shlevy as the author of the issue