monero: make dummy payment ID zeroes when it's included in a tx #514
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This ensures when sending to a single counter-party who doesn't use an integrated address, the counter-party would see a payment ID of all zeroes, rather than random values. Matches wallet2's behavior (can check the change to the
receipt_of_wallet_rpc_tx_standard
test in this PR to see wallet2's behavior).Note the 2 special circumstances in which wallet2 ignores the payment ID:
Also note that when using monero-serai to send to 2 destinations with no change, monero-serai would not include a payment ID since 1) it doesn't know which recipient should see the payment ID, and 2) this tx is fingerprintable by the fee anyway (the change is shunted to the fee).
I also did some minor cleaning of
InternalPayment::Change