nixos/systemd: unconditional systemd-journald-audit.socket

Containers did not have *systemd-journald-audit.socket* in *additionalUpstreamSystemUnits*, which meant that the unit was not provided.
However the *wantedBy* was added without any additional check, therefore creating an empty unit with just the *WantedBy* on *boot.isContainer* machines.
This caused `systemd-analyze verify` to fail:

```text
systemd-journald-audit.socket: Unit has no Listen setting (ListenStream=, ListenDatagram=, ListenFIFO=, ...). Refusing.
systemd-journald-audit.socket: Cannot add dependency job, ignoring: Unit systemd-journald-audit.socket has a bad unit file setting.
systemd-journald-audit.socket: Cannot add dependency job, ignoring: Unit systemd-journald-audit.socket has a bad unit file setting.
```

The upstream unit already contains the following, which should make it safe to include regardless:

```ini
[Unit]
ConditionSecurity=audit
ConditionCapability=CAP_AUDIT_READ
```

For reference, this popped up in the context of #[360426](https://redirect.github.com/NixOS/nixpkgs/issues/360426) as well as #[407696](https://redirect.github.com/NixOS/nixpkgs/pull/407696).

Co-authored-by: Bruce Toll <4109762+tollb@users.noreply.github.com>
Signed-off-by: benaryorg <binary@benary.org>

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