arrow

GH-36176: [C++] Fix regression for single-key Table sorting (#36179)



### Rationale for this change

Fixes a regression introduced in https://github.com/apache/arrow/pull/35727.

### What changes are included in this PR?

Re-implements a branch in the `Table` sorter that defers to the `ChunkedArray` sorter for single sort keys.

### Are these changes tested?

Covered by existing tests.

### Are there any user-facing changes?

No.

* Closes: #36176

Authored-by: benibus <bpharks@gmx.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>