Fix phpcs

[renatho]

Changes proposed in this Pull Request

• Fix some phpcs issues.

Testing instructions

• Make sure the dist/blocks.editor.build.css is now loaded with the correct query string to avoid cache after the changes. It's the file change time when in debug mode, or the plugin version in the prod mode.
• Make sure the Settings page (wp-admin > Settings -> SyntaxHIghlighter) still renders properly.

[alexsanford]

Looks good, works well!

[alexsanford]

Actually, just noticed that the translators: comments are in the wrong place. They should be in the line above the _x or esc_html_x calls, not the sprintf and printf calls.