[Minor] Ops, fix symbol name

conf/scores.d/rbl_group.conf

@@ -42,7 +42,7 @@ symbols = {
         description = "Sender listed at https://www.dnswl.org, high trust";
     }
 
-    "DNSWL_DWL_BLOCKED" {
+    "DWL_DNSWL_BLOCKED" {
         weight = 0.0;
         description = "Resolver blocked due to excessive queries (dwl)";
     }