io.podman.socket: drop Also=multi-user.target

Using `Also=` means that the target unit will also be
installed/uninstalled together with our unit. Doing
`Also=multi-user.target` essentially says: disable `multi-user.target`
if `io.podman.socket` is disabled, which sounds... not at all like
what we want.

In practice, systemd thankfully ignores this (likely because it's the
default target). I think having `Also=io.podman.socket` in the
`io.podman.service` already does what we want here: it gets installed
under `sockets.target` whenever the service is. (And the fact that
systemd ignored this means that it wasn't actually playing a role in
resolving #3998.)

This was causing `systemctl preset-all` to dump core in Fedora CoreOS:
https://github.com/coreos/fedora-coreos-tracker/issues/290

(Likely there's a systemd bug around here too.)

Signed-off-by: Jonathan Lebon <jonathan@jlebon.com>

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