nixos/frigate: Also listen on port 5000

Frigate wants to connect on 127.0.0.1:5000 for unauthenticated requests
by checking the request port. This adress is hardcoded in the source.
See #370349 for more details

nixos/modules/services/video/frigate.nix

@@ -477,6 +477,10 @@ in
           };
         };
         extraConfig = ''
+          # Frigate wants to connect on 127.0.0.1:5000 for unauthenticated requests
+          # https://github.com/NixOS/nixpkgs/issues/370349
+          listen 127.0.0.1:5000;
+
           # vod settings
           vod_base_url "";
           vod_segments_base_url "";