Fix error when warning about pagy configuration redundancy

[ellnix]

Pull Request

Related issue

Fixes #294

What does this PR do?

• ...

PR checklist

Please check if your PR fulfills the following requirements:

• [X] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• [X] Have you read the contributing guidelines?
• [X] Have you made sure that the title is accurate and descriptive of the changes?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (e5ad4d1) 89.04% compared to head (1331d3f) 89.04%. Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #295 +/- ## ======================================= Coverage 89.04% 89.04% ======================================= Files 10 10 Lines 657 657 ======================================= Hits 585 585 Misses 72 72 ```

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[meili-bors[bot]]

Build succeeded:

• integration-tests (Rails 6.1 with Ruby 2.7)
• integration-tests (Rails 6.1 with Ruby 3.0)
• integration-tests (Rails 6.1 with Ruby 3.1)
• integration-tests (Rails 7 with Ruby 2.7)
• integration-tests (Rails 7 with Ruby 3.0)
• integration-tests (Rails 7 with Ruby 3.1)
• linter-check
• smoke-test