[Rspamd] Remove autolearn from Rspamd

data/conf/rspamd/local.d/statistic.conf

@@ -7,7 +7,6 @@ classifier "bayes" {
     name = "per_domain_bayes";
     min_tokens = 11;
     min_learns = 20;
-    autolearn = [-20, 50];
     new_schema = true;
     expiry = 50d;
     per_user = <<EOD