Update small example to have same region and zone as high-io

[nick-stroud]

Submission Checklist:

• Have you installed and run this change against pre-commit? pre-commit install
• Are all tests passing? make tests
• If applicable, have you written additional unit tests to cover this
  change?
• Is unit test coverage still above 80%?
• Have you updated any application documentation such as READMEs and user
  guides?
• Have you followed the guidelines in our Contributing document?

[tpdownes]

@cboneti does this have any impact on integration tests? (or what the integration tests are intended to test)

[nick-stroud]

does this have any impact on integration tests? (or what the integration tests are intended to test)

@tpdownes, Integration test do not run examples/hpc-cluster-small.yaml. They run lustre-with-new-vpc.yaml and hpc-cluster-high-io.yaml, so this should have on effect.

[cboneti]

No impact. But thanks for checking.