Rusty Russell 576d003cf0 pytest: fix flake in test_wumbo_channels ...

We need to wait for *l2* to see the channel in CHANNELD_NORMAL,
otherwise the array here is empty:

```
	chan = only_one([c for c in l1.rpc.listpeerchannels(l2.info['id'])['channels'] if c['state'] == 'CHANNELD_NORMAL'])
        amount = chan['funding']['local_funds_msat']
        assert amount > Millisatoshi(str((1 << 24) - 1) + "sat")
    
        # We should know we can spend that much!
        spendable = chan['spendable_msat']
        assert spendable > Millisatoshi(str((1 << 24) - 1) + "sat")
    
        # So should peer.
>       chan = only_one([c for c in l2.rpc.listpeerchannels(l1.info['id'])['channels'] if c['state'] == 'CHANNELD_NORMAL'])

tests/test_connection.py:3552: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

arr = []

    def only_one(arr):
        """Many JSON RPC calls return an array; often we only expect a single entry
        """
>       assert len(arr) == 1
E       AssertionError
```

2024-11-19 17:51:18 +10:30

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