fixes a php notice in 8.2

[circlecube]

There is a notice when a brand plugin as the builder plugin are both active. This change simply defines the property so it is not dynamically defined.

Deprecated: Creation of dynamic property NewfoldLabs\WP\Module\Deactivation\DeactivationSurvey::$strings is deprecated

Proposed changes

Type of Change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• Linting and tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments