fundingmanager+lnwallet: add HTLC dust limit logic

lnwallet/parameters.go

@@ -1,12 +1,12 @@
 package lnwallet
 
 import (
-	"github.com/roasbeef/btcwallet/wallet/txrules"
 	"github.com/roasbeef/btcutil"
+	"github.com/roasbeef/btcwallet/wallet/txrules"
 )
 
 // DefaultDustLimit is used to calculate the dust HTLC amount which will be
-// proposed to other node during channel creation.
+// send to other node during funding process.
 func DefaultDustLimit() btcutil.Amount {
 	return txrules.GetDustThreshold(P2WSHSize, txrules.DefaultRelayFeePerKb)
 }