[Fix] current_single_content magic tag was over-escaped

[abaicus]

Summary

Fixes issue with {current_single_content} magic tag that was over-escaped, not allowing post HTML.

Will affect visual aspect of the product

NO

Test instructions

• Please refer to the initial issue for testing steps as they are defined perfectly well there as well.

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 Codeinwp/neve-pro-addon#2992.

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[rodica-andronache]

tested and it's working well 👍

[pirate-bot]

🎉 This PR is included in version 4.1.0 🎉

The release is available on GitHub release

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