dd41e87295
`NostrTransport.update_relays()` raises a `KeyError` when the offer of the configured swapserver (`config.SWAPSERVER_NPUB`) is not in `self._offers` even though `sm.pairs_updated` gets triggered. This happens because `NostrTransport.get_pairs()` called `sm.update_pairs()` before adding the received offer to `self._offers`.