DAOS-18487 object: hulk data only consumes 1 unit

[gnailzenh]

The idea of adding hulk data is supporting degraded read with unlimited size: one engine only allows 2 inflight unlimited degraded reads, and each consumes one unit.

Steps for the author:

• Commit message follows the guidelines.
• Appropriate Features or Test-tag pragmas were used.
• Appropriate Functional Test Stages were run.
• At least two positive code reviews including at least one code owner from each category referenced in the PR.
• Testing is complete. If necessary, forced-landing label added and a reason added in a comment.

After all prior steps are complete:

• Gatekeeper requested (daos-gatekeeper added as a reviewer).

[github-actions]

Errors are Unable to load ticket data
https://daosio.atlassian.net/browse/DAOS-18487

[liuxuezhao]

@gnailzenh just added 2 questions on #17439, please check if it is problem or not? thanks.

[gnailzenh]

I'm force-landing this one because it's one line fix for currently inactive code.