Category selector don't overflow through the search container

We need the truncation for the category badges in the hamburger menu, but the style rule was too broad, it was applying to all menu panels. I restricted it to just the category badges in the hamburger menu in https://github.com/discourse/discourse/commit/aca2697a42e04b3e5cd9c3d354ed6151276a0ab1, should be better now for the search results in the OP.

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