jquery: adjust site nav line-height

Set the amount via line-height to match the previous height exactly,
rather than approximating via padding.

Ref #451

Author: Krinkle

themes/jquery/css/base.css

@@ -1656,7 +1656,8 @@ nav#main li {
 nav#main li a {
 	color: #fff;
 	text-decoration: none;
-	padding: 2px 10px;
+	padding: 0 10px;
+	line-height: 32px;
 	display: block;
 	border: 1px solid transparent;
 	text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.76);