[Rspamd] Slightly reduce BAD REP POL score

data/conf/rspamd/local.d/groups.conf

@@ -7,7 +7,7 @@ symbols {
     score = 0.0;
   }
   "BAD_REP_POLICIES" {
-    score = 2.5;
+    score = 2.0;
   }
   "BULK_HEADER" {
     score = 3.5;