Unfortunately a spec typo means the data fields are missing (PR pending),
so we still patch those in.
The message "your_peer_storage" got renamed to "peer_storage_retrieval",
and the option "want_peer_backup_storage" was removed.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-EXPERIMENTAL: `experimental-peer-storage` now only advertizes feature 43, not 41.
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