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GH-42224: [Java] Fix Typo in TestAceroSubstraitConsumer Test Method (#42225)



### Rationale for this change

Fixes a typo causing a `NullPointerException` in the test method

### What changes are included in this PR?

- Updating typo to fix Unit Test

### Are these changes tested?

Yes

### Are there any user-facing changes?

No.

* GitHub Issue: #42224

Authored-by: Hyunseok Seo <hsseo0501@gmail.com>
Signed-off-by: David Li <li.davidm96@gmail.com>