FIX: ensures topic count is correctly showing in box category badges (PR #9034)

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This pull request has been mentioned on Discourse Meta. There might be relevant details there:

https://meta.discourse.org/t/box-style-category-background-color-overlapping-the-number-of-topics-in-the-category-selector/142521/4

This pull request has been mentioned on Discourse Meta. There might be relevant details there:

https://meta.discourse.org/t/boxed-categories-selector-minor-issue/147016/1