fix(ops/modules/irccat): only start after network is online

I've discovered that it is possible for irccat to fail enough times to
run into the restart limit before network is online after booting.

Change-Id: Ia54a46d56bdc765a825fee50e7bdc8206718edc0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12790
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: sterni <sternenseemann@systemli.org>

ops/modules/irccat.nix

@@ -48,6 +48,8 @@ in
     systemd.services.irccat = {
       inherit description;
       wantedBy = [ "multi-user.target" ];
+      after = [ "network-online.target" ];
+      wants = [ "network-online.target" ];
 
       serviceConfig = {
         ExecStart = "${mergeAndLaunch}";