fix(core): record correct pubkey for ln payments #4428
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Description
There is a bug where we optimistically assign the default lnd's pubkey to payment entries and we don't change this after it's initially set. This led to the problem where we couldn't update a payment if the pubkey we were looking up for it was false (temporarily mitigated in #4420).
This PR is to be more deliberate with recording/updating the actual pubkey that is used to send a payment as it happens thoughout the send flow.