Fixed lightbox issue with alignment control

[girishpanchal30]

Summary

Fixed issue with WP default lightbox model.

Test instructions

1. Add an image block
2. enable “Expand on click” for the image
3. change the alignment of the image ( left/right/center) -> when an alignment option (other than None ) is enabled, the image doesn't expand to full width

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 #4260

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[rodica-andronache]

tested and it's working well 👍

[selul]

@girishpanchal30 we are not looking to increase the CSS limit so please review the solution within the boundaries.

[girishpanchal30]

@selul I've added an inline style instead of adding CSS in the main style.

[rodica-andronache]

tested and it's still working