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GH-40233: [C++] Fix an abort on asof_join_benchmark run for lost an arg (#40234)



### Rationale for this change
Fix an abort error on asof_join_benchmark run for lost an arg.

### What changes are included in this PR?
Add the lost arg back.

### Are these changes tested?

### Are there any user-facing changes?
No

* GitHub Issue: #40233

Authored-by: hugo.zhang <hugo.zhang@openpie.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>