Otherwise, deprecating a field causes SELECT * to fail:
```
> l1.rpc.sql(f"SELECT * FROM peerchannels;")
...
> raise RpcError(method, payload, resp['error'])
E pyln.client.lightning.RpcError: RPC call failed: method: sql, payload: ('SELECT * FROM peerchannels;',), error: {'code': -1, 'message': 'query failed with access to peerchannels.max_total_htlc_in_msat is prohibited (Deprecated column table peerchannels.max_total_htlc_in_msat)'}
```
So if they use a wildcard, allow access: though "SELECT *" is fraught,
"COUNT(*)" is perfectly legit.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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