servo: fix missing route table for doof

hosts/by-name/servo/net.nix

@@ -179,9 +179,11 @@ in
     };
 
     # create a new routing table that we can use to proxy traffic out of the root namespace
-    # through the ovpns namespace, and to the WAN via VPN.
+    # through the wireguard namespaces, and to the WAN via VPN.
+    # i think the numbers here aren't particularly important.
     networking.iproute2.rttablesExtraConfig = ''
-      5 ovpns
+      11 ovpns
+      12 doof
     '';
     networking.iproute2.enable = true;
   };