Fix not updating backlog histlen when trimming repl backlog (#9713)
Since the loop in incrementalTrimReplicationBacklog checks the size of histlen,
we cannot afford to update it only when the loop exits, this may cause deleting
much more replication blocks, and replication backlog may be less than setting size.
introduce in #9166
Co-authored-by:
sundb <sundbcn@gmail.com>
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