We generate a reply path by simply reversing the outgoing path:
A->B->C gives reply path B->A
A->B gives reply path A
But if we are not a public node, we can't use ourselves as the first
entry of the reply path: this happens if we directly connect to the
head of a blinded path (as we now support).
In this case, give the entire path as a blinded path. We could do
this all the time, but there are some cases where nodes don't like
sending replies where the node itself is the head of the blinded
path (like CLN v24.05 or before!).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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