lnwallet: move btcwallet log under BTWL

So we can focus on debugging `BTWL` without concerning `lnwallet`, which
has a lot of channel-specific loggings.

lnwallet/log.go

@@ -2,9 +2,6 @@ package lnwallet
 
 import (
 	"github.com/btcsuite/btclog/v2"
-	"github.com/btcsuite/btcwallet/chain"
-	btcwallet "github.com/btcsuite/btcwallet/wallet"
-	"github.com/btcsuite/btcwallet/wtxmgr"
 	"github.com/lightningnetwork/lnd/build"
 	"github.com/lightningnetwork/lnd/lnwallet/chainfee"
 )
@@ -31,8 +28,5 @@ func DisableLog() {
 func UseLogger(logger btclog.Logger) {
 	walletLog = logger
 
-	btcwallet.UseLogger(logger)
-	wtxmgr.UseLogger(logger)
-	chain.UseLogger(logger)
 	chainfee.UseLogger(logger)
 }