chore: remove unused code

Author: igor-sirotin

waku/v2/protocol/enr/shards.go

@@ -1,10 +1,9 @@
 package enr
 
 import (
-	"errors"
-
 	"github.com/ethereum/go-ethereum/p2p/enode"
 	"github.com/ethereum/go-ethereum/p2p/enr"
+
 	"github.com/waku-org/go-waku/waku/v2/protocol"
 )
 
@@ -43,21 +42,6 @@ func WithWakuRelaySharding(rs protocol.RelayShards) ENROption {
 	}
 }
 
-func WithWakuRelayShardingTopics(topics ...string) ENROption {
-	return func(localnode *enode.LocalNode) error {
-		rs, err := protocol.TopicsToRelayShards(topics...)
-		if err != nil {
-			return err
-		}
-
-		if len(rs) != 1 {
-			return errors.New("expected a single RelayShards")
-		}
-
-		return WithWakuRelaySharding(rs[0])(localnode)
-	}
-}
-
 // ENR record accessors
 
 func RelayShardList(record *enr.Record) (*protocol.RelayShards, error) {