Revert "nixos/polkit: guard static gid for polkituser behind state version"
This reverts commit 2265160fc0b4cc9a38b392ec3b3a3fe18c2e5413 and
e56db577a1f69c02e80d8bc26d514c01a2c5cc61.
Ideally, we shouldn't cause friction for users that bump `stateVersion`,
and I'd consider having to switch and/or manually hardcode a UID/GID
to supress the warning friction. I think it'd be more beneficial to, in
this rare case of an ID being missed, just let it be until more
discussion happens surrounding this overall issue.
See https://github.com/NixOS/nixpkgs/pull/217785 for more context.