wallet: don't warn if ignored is unset in accounts.db.

Note that this can only happen if you ran a master commit before rc1:

```
2025-08-21T10:03:03.255Z **BROKEN** lightningd: bookkeper migration: Accessing a null column e.ignored/15 in query SELECT  e.id, e.account_id, a.name, e.origin, e.tag, e.credit, e.debit, e.output_value, e.currency, e.timestamp, e.blockheight, e.utxo_txid, e.outnum, e.spending_txid, e.payment_id, e.ignored, e.stealable, e.ev_desc, e.spliced, a.closed_count, a.peer_id, a.we_opened FROM chain_events e LEFT OUTER JOIN accounts a ON e.account_id = a.id ORDER BY e.timestamp, e.id;
```

Signed-off-by: Rusty Russell <[email protected]>

Author: rustyrussell

wallet/account_migration.c

@@ -124,7 +124,11 @@ static struct chain_event *stmt2chain_event(const tal_t *ctx, struct db_stmt *st
 	} else
 		e->spending_txid = NULL;
 
-	e->ignored = db_col_int(stmt, "e.ignored") == 1;
+	/* If they ran master before this, ignored might be null! */
+	if (db_col_is_null(stmt, "e.ignored"))
+		e->ignored = false;
+	else
+		e->ignored = db_col_int(stmt, "e.ignored") == 1;
 	e->stealable = db_col_int(stmt, "e.stealable") == 1;
 
 	if (!db_col_is_null(stmt, "e.ev_desc"))