fix: use selector with direct descendant, tested old issue

[Arukuen]

fixes #3398
fixes #3406

Tested the previous issue on Local with multisite (subdirectories), with non-admin account (editor). No block error so far.

[github-actions]

🤖 Pull request artifacts

file	commit
pr3416-stackable-3416-merge.zip	207f1c5

[github-actions]

Try this Pull Request in the WordPress playground: https://playground.wordpress.net/?mode=seamless#{"landingPage":"/wp-admin/post-new.php?post_type=page","preferredVersions":{"php":"latest","wp":"latest"},"steps":[{"step":"login","username":"admin","password":"password"},{"step":"installPlugin","pluginZipFile":{"resource":"url","url":"https://raw.githubusercontent.com/gambitph/Stackable/artifacts/pr3416-stackable-3416-merge.zip"}}]}

[bfintal]

Changing the way column ordering works by changing the main selector will cause unforeseen problems. Since the underlying issue is that the reordering styles are also affecting nested columns, the better solution would be to introduce something that limits the styles from only being applied to the current columns (and not to their children)

[bfintal]

Closed in favor of #3423