More consistent fonts and improved spacing for search results

We mostly use a serif font for text bosy, however the search is currently
using sans serif. The search results are also very spaced out, limiting
the number that are visible on the screen at any one time.

Tweak to use the serif font used elsewhere and loose some of the white
space.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>