recurring-donations: add netns

- Adds recurring-donations to netns-isolation.services
- Adds cfg.enforceTor to bring recurring-donations in line with other
  services
- Removes torsocks dependency in favor of `curl --socks-hostname`

modules/netns-isolation.nix

@@ -119,6 +119,11 @@ in {
           id = 19;
           connections = [ "nginx" "lightning-charge" ];
         };
+        recurring-donations = {
+          id = 20;
+          # communicates with clightning over lightning-rpc socket
+          connections = [];
+        };
       };
 
       systemd.services = {