[Rspamd] Add fuzzy hash to msg

data/conf/rspamd/local.d/milter_headers.conf

@@ -7,6 +7,9 @@ routines {
     value = "YES";
     remove = 1;
   }
+  fuzzy-hashes {
+    header = "X-Rspamd-Fuzzy";
+  }
   authentication-results {
     header = "Authentication-Results";
     remove = 1;