🇺🇦Ukraine @rybchynski

1. Removed useless comment regarding ES6 from the js file.
2. Reverted formatting code changes from the test file.

A link to the change record: Added filter for the image styles on the image style list page →
Please review.

Thank you @smustgrave

I'm currently creating change record for the issue.

1. Fixed test issues -- (Updated `ImageStyleListBuilder.php`);
2. Added test case to `ImageAdminStylesTest.php`;