Remove score from R_DKIM_PERMFAIL

This error happens when there is no public key in DNS for that selector.

data/conf/rspamd/local.d/policies_group.conf

@@ -11,9 +11,6 @@ symbols = {
     "R_DKIM_REJECT" {
         score = 10.0;
     }
-    "R_DKIM_PERMFAIL" {
-        score = 10.0;
-    }
     "DMARC_POLICY_REJECT" {
         weight = 20.0;
         description = "DMARC reject policy";