Added in https://pagure.io/fedora-logos/pull-request/27 there's now a
logo in a format acceptable to WSL. This adds a dependency on the logos
package and configures the icon setting for the distribution.
This includes the tmpfiles config to link the various WSL-provided
service sockets to the expected location.
It also includes an override snippet for systemd-firstboot to have it
not run inside WSL for the present as it hangs forever.
