Promtail: Keep default "targets"

... localhost is only viable option and also the default according to
https://grafana.com/docs/loki/latest/clients/promtail/configuration/#static_configs

morph/lib/storage.nix

@@ -53,7 +53,6 @@ in {
           job_name = "tahoe-corruption-advisories";
           static_configs = [
             {
-              targets = [ "localhost" ];
               labels = {
                 job = "tahoe-corruption-advisories";
                 __path__ = "/storage/corruption-advisories/*";