IGNITE-16255 Fix WalIterator#lastRead return next record in the middle of iteration

[nizhikov]

StandaloneWalIterator#lastRead pointer updated on advance method and point to the last correctly read record.

advance method read a record that is a step ahead so lastRead points to the next record during iteration
and last record returned by the Iterator#next method in the end of iteration.

This PR makes behavior of the StandaloneWalIterator#lastRead consistent and always point to the last record returned by the Iterator#next method.

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[nizhikov]

Hello @tkalkirill

Can you, please, take a look at my changes?

[tkalkirill]

Hello @tkalkirill

Can you, please, take a look at my changes?

Hi @nizhikov, I'll take a look today / tomorrow.