import walletdb/bdb for side effects (registers driver)

wallet/setup.go

@@ -35,6 +35,7 @@ import (
 	"github.com/btcsuite/btcwallet/waddrmgr"
 	"github.com/btcsuite/btcwallet/wallet"
 	"github.com/btcsuite/btcwallet/walletdb"
+	_ "github.com/btcsuite/btcwallet/walletdb/bdb"
 )
 
 var (