Fix storage row line height

What does this MR do and why?

It fixes the storage row, where it has slightly reduced line height that caused some letters (most obvious in gs and ys) to be cut off from the bottom.

Thanks to @rdickenson for catching it!

Screenshots or screen recordings

before	after

How to set up and validate locally

1. From rails console, enable Feature.enable(:namespace_storage_limit)
2. Navigate to a group (that has projects) you're a maintainer of
3. Go to group's Settings -> Usage Quota
4. Expand one project's row to see its storage details

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.