nixos/nftables: remove default systemd dependencies

With DefaultDependencies enabled, systemd adds "After=basic.target" to
service units. `basic.target` has a dependency on `sockets.target`, so
the `nftables` has (amongst others) the following order constraints:

* Before=network-pre.target
* After=sockets.target

Those constraints are often unsatisfiable. For example, `systemd-networkd`
has a dependency `After=network-pre.target`. When a socket unit now uses
`BindToDevice=` on a device managed by `networkd`, a timeout occurs
because `networkd` waits for `network-pre.target`, but
`network-pre.target` depends (through nftables) on `sockets.target`, but
the device to bind the socket to is never brought up, as this would
happen through `networkd`.

This is fixed by removing the implicit dependency on `basic.target`.

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