Use Anchor channels in CLN integration test

.. because they will be the new default.

Note the upcoming CLN 24.02 release will make Anchors default, too, but
for now we have to set the `experimental-anchors` config option.

docker-compose-cln.yml

@@ -63,6 +63,7 @@ services:
         "--bitcoin-rpcuser=user",
         "--bitcoin-rpcpassword=pass",
         "--regtest",
+        "--experimental-anchors",
       ]
     ports:
       - "19846:19846"

tests/integration_tests_cln.rs

@@ -88,6 +88,7 @@ fn test_cln() {
 	let funding_txo = common::expect_channel_pending_event!(node, cln_node_id);
 	common::wait_for_tx(&electrs_client, funding_txo.txid);
 	common::generate_blocks_and_wait(&bitcoind_client, &electrs_client, 6);
+	node.sync_wallets().unwrap();
 	let user_channel_id = common::expect_channel_ready_event!(node, cln_node_id);
 
 	// Send a payment to CLN