Themes: Remove spurious chars from logged-out

[ockham]

There's a closing component-and-conditional /> } in logged-out which is a leftover from copying from multi-site where this is actually needed.

To test:

• Incognito window, calypso.localhost:3000/design
• The issue is visible on master if you search for a term that will return only few themes so you see the bottom of the page (try 'Espresso').
• Verify it's fixed on this branch

[seear]

👍