itest: remove unnecessary channel close and node shutdown

Since we don't have standby nodes anymore, we don't need to close the
channels when the test finishes. Previously we would do so to make sure
the standby nodes have a clean state for the next test case, which is no
longer relevant.

itest/lnd_max_htlcs_test.go

@@ -25,14 +25,13 @@ func testMaxHtlcPathfind(ht *lntest.HarnessTest) {
 	cfgs := [][]string{cfg, cfg}
 
 	// Create a channel Alice->Bob.
-	chanPoints, nodes := ht.CreateSimpleNetwork(
+	_, nodes := ht.CreateSimpleNetwork(
 		cfgs, lntest.OpenChannelParams{
 			Amt:            1000000,
 			PushAmt:        800000,
 			RemoteMaxHtlcs: uint16(maxHtlcs),
 		},
 	)
-	chanPoint := chanPoints[0]
 	alice, bob := nodes[0], nodes[1]
 
 	// Alice and bob should have one channel open with each other now.
@@ -78,8 +77,6 @@ func testMaxHtlcPathfind(ht *lntest.HarnessTest) {
 
 	ht.AssertNumActiveHtlcs(alice, 0)
 	ht.AssertNumActiveHtlcs(bob, 0)
-
-	ht.CloseChannel(alice, chanPoint)
 }
 
 type holdSubscription struct {