itests: add itest for ListSweeps's start_height

lntest/rpc/wallet_kit.go

@@ -159,11 +159,16 @@ func (h *HarnessRPC) VerifyMessageWithAddr(
 }
 
 // ListSweeps makes a ListSweeps RPC call to the node's WalletKit client.
-func (h *HarnessRPC) ListSweeps(verbose bool) *walletrpc.ListSweepsResponse {
+func (h *HarnessRPC) ListSweeps(verbose bool,
+	startHeight int32) *walletrpc.ListSweepsResponse {
+
 	ctxt, cancel := context.WithTimeout(h.runCtx, DefaultTimeout)
 	defer cancel()
 
-	req := &walletrpc.ListSweepsRequest{Verbose: verbose}
+	req := &walletrpc.ListSweepsRequest{
+		Verbose:     verbose,
+		StartHeight: startHeight,
+	}
 	resp, err := h.WalletKit.ListSweeps(ctxt, req)
 	h.NoError(err, "ListSweeps")