fix: correct variable name for column definitions in checkbox selecti…

[mholthausen]

Description

This PR fixes a minor issue where the variable name used to check for the presence of checkboxSelection in column definitions was incorrect. The variable colDefs was renamed to columnDefs as colDefs was used before it was initialized.

@terrestris/devs please review

Pull request type

• Bugfix
• Feature
• Dependency updates
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe)

Do you introduce a breaking change?

• Yes
• No

Checklist

• I understand and agree that the changes in this PR will be licensed under the
  BSD-2-Clause.
• I have followed the guidelines for contributing.
• The proposed change fits to the content of the Code of Conduct.
• I have added or updated tests and documentation, and the test suite passes (run npm run check locally).
• I have added a screenshot/screencast to illustrate the visual output of my update.

[dnlkoch]

🎉 This PR is included in version 25.1.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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