bug: fix ibc transfer from canto to external chain (#71)

* fix: Set ics4 wrapper for ibc transfer keeper

* chore: Remove comment related ibc fee module

app/app.go

@@ -582,7 +582,7 @@ func NewCanto(
 	// since fee middleware will wrap the IBCKeeper for underlying application.
 	app.TransferKeeper = ibctransferkeeper.NewKeeper(
 		appCodec, keys[ibctransfertypes.StoreKey], app.GetSubspace(ibctransfertypes.ModuleName),
-		nil, // ISC4 Wrapper: fee IBC middleware
+		app.IBCKeeper.ChannelKeeper, // ICS4 Wrapper
 		app.IBCKeeper.ChannelKeeper, app.IBCKeeper.PortKeeper,
 		app.AccountKeeper, app.BankKeeper, scopedTransferKeeper,
 		authtypes.NewModuleAddress(govtypes.ModuleName).String(),