lnwallet+chainregistry: remove unused FeeEstimator from wallet cfg

lnwallet/btcwallet/config.go

@@ -7,7 +7,6 @@ import (
 	"github.com/btcsuite/btcd/chaincfg"
 	"github.com/btcsuite/btcd/wire"
 	"github.com/btcsuite/btcutil"
-	"github.com/lightningnetwork/lnd/lnwallet"
 
 	"github.com/btcsuite/btcwallet/chain"
 	"github.com/btcsuite/btcwallet/wallet"
@@ -79,11 +78,6 @@ type Config struct {
 	// notifications for received funds, etc.
 	ChainSource chain.Interface
 
-	// FeeEstimator is an instance of the fee estimator interface which
-	// will be used by the wallet to dynamically set transaction fees when
-	// crafting transactions.
-	FeeEstimator lnwallet.FeeEstimator
-
 	// NetParams is the net parameters for the target chain.
 	NetParams *chaincfg.Params