offers: don't send blinded path to neighbor for *invoices*. #8125
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In 6e4ff6a ("offers: add a blinded path if we have no advertized address") we were overzealous, and set blinded paths not just for offers and invoicerequests, but for invoices themselves.
This has revealed various interop issues (which is great, but not good for our users!) so we should disable that. It also reduces the reliability of payments in general.
Changelog-None: fixes previously overzealous addition
Fixes: #8119 (really!)