We can stop listening on the incoming peer while we are closing, so we don't notice if they close:
```
['lightningd-2 2025-09-03T09:48:19.555Z **BROKEN** 0266e4598d1d3c415f572a8488830b60f7e744ed9235eb0b1ba93283b315c03518-connectd: Peer did not close, forcing close', 'lightningd-2 2025-09-03T09:48:22.918Z **BROKEN** 0266e4598d1d3c415f572a8488830b60f7e744ed9235eb0b1ba93283b315c03518-connectd: Peer did not close, forcing close']
=========================== short test summary info ============================
ERROR tests/test_misc.py::test_even_sendcustommsg - ValueError:
```
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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