nixos/immich: do not set services.redis.servers.immich.user (#345126)

    services.redis.servers = mkIf cfg.redis.enable {

      immich = {

        enable = true;

        user = cfg.user;

        port = cfg.redis.port;

        bind = mkIf (!isRedisUnixSocket) cfg.redis.host;

      };

        RuntimeDirectory = "immich";

        User = cfg.user;

        Group = cfg.group;

        # ensure that immich-server has permission to connect to the redis socket.

        SupplementaryGroups = mkIf (cfg.redis.enable && isRedisUnixSocket) [

          config.services.redis.servers.immich.group

        ];

      };

    };