[HOT-FIX][SQL][ML] Fix compile error from use of DataFrame in Java MaxAbsScaler example

## What changes were proposed in this pull request?

Fix build failure introduced in #11392 (change `DataFrame` -> `Dataset<Row>`).

## How was this patch tested?

Existing build/unit tests

Author: Nick Pentreath <nick.pentreath@gmail.com>

Closes #11653 from MLnick/java-maxabs-example-fix.