sdk/hints: eliminate two unnecessary unsafe conversions on copy.

sdk/hints/badgerh/keys.go

@@ -3,7 +3,6 @@ package badgerh
 import (
 	"encoding/binary"
 	"encoding/hex"
-	"unsafe"
 
 	"github.com/nbd-wtf/go-nostr"
 )
@@ -11,7 +10,7 @@ import (
 func encodeKey(pubhintkey, relay string) []byte {
 	k := make([]byte, 32+len(relay))
 	hex.Decode(k[0:32], []byte(pubhintkey))
-	copy(k[32:], unsafe.Slice(unsafe.StringData(relay), len(relay)))
+	copy(k[32:], relay)
 	return k
 }