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memtx: do not pass pagination key to MVCC

Currently, when starting an iterator in memtx tree on a range request,
we pass key from `start_data` to memtx MVCC. The problem is `start_data`
can contain pagination key that is extracted with `cmp_def`, but MVCC
performs all comparisons with `key_def`. Fortunately, first parts of
`cmp_def` is actually `key_def` of the index, so let's crop `start_data`
by passing `part_count` not greater than `key_def->part_count` to MVCC.

Closes #10448

NO_DOC=bugfix

(cherry picked from commit 0dca0076c)

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