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GH-42208: [Java] Fix the Test in flight-sql-jdbc-driver Module (#42217)



### Rationale for this change

Adjust assertion message order for JUnit 5 compatibility.

### What changes are included in this PR?

- Reordering the arguments of `assertEquals(expected, actual, message)`

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.

* GitHub Issue: #42208

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