csn: Use ttl not ttl - height

[dergoegge]

The ttl values being send now are actually the ttls not heights, so the
subtraction is not needed anymore.

Also @adiabat since the verification logic got changed the overWire variable is currently not used but the place to collect the positions for the playbooks would be in the else branch here and here.
p.populate is called for every root that was involved in the verification, so what you need to do to get all the "overwire" positions for the entire proof is: collect the "overwire" positions in each populate call and then concat all these together, sort them and store them in the playbook file.

[kcalvinalvin]

ACK

For future reference the subtraction happens here in the bridgenode side.

utreexo/bridgenode/flatfileworker.go

Lines 251 to 252 in 760cec1

	binary.BigEndian.PutUint32(
	ttlArr[:], uint32(ttlRes.Height-c.createHeight))

[adiabat]

Aha good catch, hopefully I haven't mixed it up anywhere else. It's tricky because both ways to record it would work (how long it lives, or when it dies)