Change value for padding on pagination to variables

less/pagination.less

@@ -12,7 +12,7 @@
     > a,
     > span {
       float: left; // Collapse white-space
-      padding: 4px 12px;
+      padding: @padding-base-vertical @padding-base-horizontal;
       line-height: @line-height-base;
       text-decoration: none;
       background-color: @pagination-bg;