Issue #3556760 by DYdave: Gitlab CI: Fixed PHPCS validation error.

David Suissarequested to merge
issue/collapse_text-3556760:3556760-gitlabci-fix-phpcs into 2.0.x

https://www.drupal.org/project/collapse_text/issues/3556760

Gitlab CI: Fixed PHPCS validation error by removing unnecessary string concatenation.

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