rspamd: fixed dqs rbl insertion handling

data/conf/rspamd/local.d/rbl.conf

@@ -21,6 +21,6 @@ rbls {
     }
   }
 
-.include(try=true,priority=5) "$LOCAL_CONFDIR/custom/dqs-rbl.conf"  
+.include(try=true,override=true,priority=5) "$LOCAL_CONFDIR/custom/dqs-rbl.conf"  
 
 }