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memtx: reference tuples when rolling back statements without story

During the latest rework of DDL in MVCC, the new helper
`memtx_tx_history_rollback_empty_stmt` was introduced - it is used for
statements without stories (such statements can appear, for example,
when DDL removes all stories). By mistake, we forgot to unreference the
new tuple and reference the old one there - the commit fixes this
embarrassing mistake.

Follow-up #10146

NO_CHANGELOG=bugfix for unreleased patch
NO_DOC=bugfix

(cherry picked from commit 32797f703)

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