routerrpc: update final cltv delta default

The default was increased for the main sendpayment RPC in commit
d3fa9767a9. This commit sets the
same default for QueryRoutes, routerrpc.SendPayment and
router.EstimateRouteFee.

lnrpc/routerrpc/router_backend_test.go

@@ -121,7 +121,7 @@ func testQueryRoutes(t *testing.T, useMissionControl bool, useMsat bool) {
 		amt lnwire.MilliSatoshi, restrictions *routing.RestrictParams,
 		_ record.CustomSet,
 		routeHints map[route.Vertex][]*channeldb.ChannelEdgePolicy,
-		finalExpiry ...uint16) (*route.Route, error) {
+		finalExpiry uint16) (*route.Route, error) {
 
 		if int64(amt) != amtSat*1000 {
 			t.Fatal("unexpected amount")