Revert "Display 0% correctly"

Fixes #231.

For easy verification, [this](http://localhost:8080/mp.php?mpn=Sarah_Hanson-Young&mpc=Senate&house=senate&display=allfriends) is a mp with a 100% friend, [this](http://localhost:8080/mp.php?mpn=Tony_Zappia&mpc=Makin&house=representatives&display=allfriends) is a mp with a 0% friend (at least in my dataset).