fix: widget not loading

[preda-bogdan]

Summary

Fixed widget not loading as a result of the recent changes.
Added E2E test.

Will affect visual aspect of the product

NO

Screenshots

Test instructions

1. Use a theme that supports Widgets
2. Go to: Appearance > Widgets
3. Check that the Visualizer block can be added and that it works as expected.

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.

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