describe_scidd() was labeling any channel as "the invoice's route hint"
when there was a single-hop route hint, even if the error occurred on
an unrelated intermediate channel.
Now we check the channel actually matches the route hint's
short_channel_id before using that label.
Fixes: #8252
Changelog-Fixed: xpay: error messages no longer incorrectly label intermediate channels as "the invoice's route hint".
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3c08a8bdb9