No need to remove the 'gutenberg_enqueue_global_styles_assets' action

[Mamaduka]

What?

There's no need for those function calls; the gutenberg_enqueue_global_styles_assets method was removed in #41306.

Testing Instructions

CI tests should pass.

[github-actions]

Flaky tests detected in 8b9ad5e.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/4044384098
📝 Reported issues:

• [Flaky Test] displays in site editor even when comments are closed by default #46820 in specs/experiments/blocks/post-comments-form.test.js
• [Flaky Test] shouldn't conflict with server-side autosave #35176 in specs/editor/various/autosave.test.js

[Mamaduka]

I'm going to merge. It's a small clean-up PR.