Update select_spec.rb

[JuanVqz]

Describe the change

What does this Pull Request do? Remove unused let statement

Why are we doing this?

cleaning up test suite

Benefits

How will the library improve?

Drawbacks

Possible drawbacks applying this change.

Requirements

• [ ] Tests written & passing locally?
• [ ] Code style checked?
• [ ] Rebased with master branch?
• [ ] Documentation updated?
• [ ] Changelog updated?