litcli: remove default value for sat_per_vbyte

This commit removes the default value of 1 for `sat_per_vbyte` that's
being passed to `litd` rpc endpoint `fundchannel`. `litd` handles this
now perfectly on its own, and adding logic here only adds to the
confusion.

cmd/litcli/ln.go

@@ -64,7 +64,6 @@ var fundChannelCommand = cli.Command{
 			Usage: "(optional) a manual fee expressed in " +
 				"sat/vByte that should be used when crafting " +
 				"the transaction",
-			Value: 1,
 		},
 		cli.Uint64Flag{
 			Name: "push_amt",