Fix plugin dependency whitespace

[Presskopp]

This follow-up fixes inconsistent whitespace in the plugin dependency list output
introduced during the dependency link refactor.

It ensures consistent spacing and avoids unintended whitespace in the rendered
dependency status markup.

Trac ticket: https://core.trac.wordpress.org/ticket/64475

[github-actions]

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Props presskopp.

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[Presskopp]

Follow-up for #10686

[Presskopp]

I'm so sorry, when I try to tidy up, I just make more mess. This should be only 1 commit

[github-actions]

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[westonruter]

Don't worry about it only being 1 commit. It will be 1 commit in SVN regardless.