Add user services for Avahi publishing

This is used for uxplay, it lets Avahi adversise services over the
network

Change-Id: I8452ac0d8a5b4b3fd03bb3404a914d34d544ccb2
Reviewed-on: https://git.clicks.codes/c/Chimera/NixFiles/+/645
Reviewed-by: Samuel Shuert <coded@clicks.codes>
Tested-by: Samuel Shuert <coded@clicks.codes>
diff --git a/modules/nixos/dns/default.nix b/modules/nixos/dns/default.nix
index ee63eb8..777dd76 100644
--- a/modules/nixos/dns/default.nix
+++ b/modules/nixos/dns/default.nix
@@ -23,6 +23,7 @@
         enable = true;
         addresses = true;
         workstation = true;
+        userServices = true;
       };
     };
   };