Summary

Fixed widget not working in Customizer context.

Will affect the visual aspect of the product

NO

Screenshots

Test instructions

1. On a theme that supports Customizer Widgets
2. Try to add a VIsualizer Chart from the Customizer.
3. All tests should pass.

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes #1156.