Debugging a number of payments showed that we sometimes waste a number
of attempts routing through a channel via its alias, rather than its
scid. This is because while we annotate the scid when it has been set,
we do not do so for the alias. The alias then is picked for routing
despite not having enough capacity, failing the attempt locally.
It can also happen that we alternate between scid and alias, doubling
the number of failed attempts before we can make progress.
This patch sets the hint for the alias to a capacity of 0 and disables
it as if the peer were offline. This means when available we'll always
use the scid, which is also far easier to read in the logs.
Changelog-Fixed: pay: We now track spendable amounts when routing on both the local alias as well as the short channel ID
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