We asserted that a node would be connected, but now we always call the
chanbackup peer_connected hook, it might not be that fast:
```
2025-05-17T08:37:58.7193306Z def test_funding_fail(node_factory, bitcoind):
...
2025-05-17T08:37:58.7204037Z # Restart l2 without ridiculous locktime.
2025-05-17T08:37:58.7204546Z del l2.daemon.opts['watchtime-blocks']
2025-05-17T08:37:58.7204990Z l2.restart()
2025-05-17T08:37:58.7206578Z l1.rpc.connect(l2.info['id'], 'localhost', l2.port)
2025-05-17T08:37:58.7207072Z
2025-05-17T08:37:58.7207522Z # We don't have enough left to cover fees if we try to spend it all.
2025-05-17T08:37:58.7208203Z with pytest.raises(RpcError, match=r'not afford'):
2025-05-17T08:37:58.7208761Z l1.rpc.fundchannel(l2.info['id'], funds)
2025-05-17T08:37:58.7209203Z
2025-05-17T08:37:58.7209598Z # Should still be connected (we didn't contact the peer)
2025-05-17T08:37:58.7210243Z assert only_one(l1.rpc.listpeers()['peers'])['connected']
2025-05-17T08:37:58.7210875Z l2.daemon.wait_for_log('Handed peer, entering loop')
2025-05-17T08:37:58.7211439Z > assert only_one(l2.rpc.listpeers()['peers'])['connected']
2025-05-17T08:37:58.7211912Z E assert False
```
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>