IncomingPayment.received.amount is incorrect (when NewChannel)

[robbiehanson]

When receiving an IncomingPayment, such that a new channel is created, the IncomingPayment.received.amount doesn't match the user's balance:

Steps to reproduce:

• Start with a clean wallet (no existing channels)
• Receive an incoming payment of 15,000 sat
• Notice that wallet balance is reported as 14,000 sat (as is channel balance)
• Notice that IncomingPayment.received.amount = 14,985 sat, with fees of only 15 sat

[t-bast]

That is linked to the recent pay-to-open changes made by @pm47 and @dpad85
The pay-to-open fee is deducted on the recipient end, so that end result is expected, but we should show the right fee.