nixos/wakapi: fix failing assertions

        message = "Both `services.wakapi.smtpPassword` `services.wakapi.smtpPasswordFile` should not be set at the same time.";

      }

      {

        assertion = cfg.db.createLocally -> cfg.db.dialect != null;

        assertion = cfg.database.createLocally -> cfg.settings.db.dialect != null;

        message = "`services.wakapi.database.createLocally` is true, but a database dialect is not set!";

      }

    ];

    warnings = [

      (lib.optionalString (cfg.db.createLocally -> cfg.db.dialect != "postgres") ''

      (lib.optionalString (cfg.database.createLocally -> cfg.settings.db.dialect != "postgres") ''

        You have enabled automatic database configuration, but the database dialect is not set to "posgres".

        The Wakapi module only supports for PostgreSQL. Please set `services.wakapi.database.createLocally`