itest: update tests with timeout_seconds

Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com>

itest/lnd_misc_test.go

@@ -178,7 +178,6 @@ func testSphinxReplayPersistence(ht *lntest.HarnessTest) {
 	// to the above generated invoice.
 	req := &routerrpc.SendPaymentRequest{
 		PaymentRequest: invoiceResp.PaymentRequest,
-		TimeoutSeconds: 60,
 		FeeLimitMsat:   noFeeLimitMsat,
 	}
 	payStream := fred.RPC.SendPayment(req)
@@ -607,7 +606,6 @@ func testRejectHTLC(ht *lntest.HarnessTest) {
 	// lnd with --rejecthtlc.
 	paymentReq := &routerrpc.SendPaymentRequest{
 		PaymentRequest: resp.PaymentRequest,
-		TimeoutSeconds: 60,
 		FeeLimitMsat:   noFeeLimitMsat,
 	}
 	ht.SendPaymentAssertFail(