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_channel_funding_fund_max_test.go

@@ -57,10 +57,7 @@ func testChannelFundMax(ht *lntest.HarnessTest) {
 	// tests.
 	args := lntest.NodeArgsForCommitType(lnrpc.CommitmentType_ANCHORS)
 	alice := ht.NewNode("Alice", args)
-	defer ht.Shutdown(alice)
-
 	bob := ht.NewNode("Bob", args)
-	defer ht.Shutdown(bob)
 
 	// Ensure both sides are connected so the funding flow can be properly
 	// executed.
@@ -229,13 +226,12 @@ func runFundMaxTestCase(ht *lntest.HarnessTest, alice, bob *node.HarnessNode,
 
 	// Otherwise, if we expect to open a channel use the helper function.
 	chanPoint := ht.OpenChannel(alice, bob, chanParams)
+	cType := ht.GetChannelCommitType(alice, chanPoint)
 
 	// Close the channel between Alice and Bob, asserting
 	// that the channel has been properly closed on-chain.
 	defer ht.CloseChannel(alice, chanPoint)
 
-	cType := ht.GetChannelCommitType(alice, chanPoint)
-
 	// Alice's balance should be her amount subtracted by the commitment
 	// transaction fee.
 	checkChannelBalance(