Fix "Unparenthesized `a ? b : c ? d : e` is deprecated"

[evgenyvolferts]

(https://github.com/kartik-v/yii2-grid/issues/934)

Fixes plugin work under PHP 7.4

Scope

This pull request includes a

• [x ] Bug fix
• [ ] New feature
• [ ] Translation

Changes

The following changes were made (this change is also documented in the change log):

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Related Issues

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