itests: add itest for ListSweeps's start_height

lntest/harness.go

@@ -2041,10 +2041,10 @@ func (h *HarnessTest) FindCommitAndAnchor(sweepTxns []*wire.MsgTx,
 //
 // NOTE: Does not account for node's internal state.
 func (h *HarnessTest) AssertSweepFound(hn *node.HarnessNode,
-	sweep string, verbose bool) {
+	sweep string, verbose bool, startHeight int32) {
 
 	// List all sweeps that alice's node had broadcast.
-	sweepResp := hn.RPC.ListSweeps(verbose)
+	sweepResp := hn.RPC.ListSweeps(verbose, startHeight)
 
 	var found bool
 	if verbose {