Momiji is right, sort of: it's not really that it hasn't been removed; it's actually been explicitly set in Tabula Rasa. If you look at the 'Tags:' list in entries, which is technically the same thing as the keyword list, you'll see the same space (and extra space between tags too; more than the space a blank space takes). I kept the same styling by default for coherence (but removed it when designers had removed it for tags in their styles).

In short, this space or these spaces can easily be removed in both lists if you someone says they should be. ;)