payment to 1/p2pkh address should account for fees

I've made a payment using `loop out` to a 1 address. The merchant was supposed to received X amount of sats, but instead `loop out` sent `X - on chain fees`. This result in the creation of a ticket as the merchant server didn't automatically reconcile the payment because the amount he received was different.

It might work differently with 3 or bc1 addresses and the problem might not be present in those cases?

Start by reproducing a loop out payment to a 1/p2pkh address and compare the merchant's received amount with the requested amount after on-chain fees. Check whether payments to 3 or bc1 addresses behave differently. Done means the merchant receives the intended amount and automatic reconciliation does not create a ticket.

Written by the indexing model from the issue text.