Remove redundant subject check in catalog-search.js

The comment selection included it.

js/catalog-search.js

@@ -21,11 +21,10 @@ if (active_page == 'catalog') {
 		//search and hide none matching threads
 		function filter(search_term) {
 			$('.replies').each(function () {
-				var subject = $(this).children('.intro').text().toLowerCase();
 				var comment = $(this).clone().children().slice(0,2).remove().end().end().text().trim().toLowerCase();
 				search_term = search_term.toLowerCase();
 
-				if (subject.indexOf(search_term) == -1 && comment.indexOf(search_term) == -1) {
+				if (comment.indexOf(search_term) == -1) {
 					$(this).parents('div[id="Grid"]>.mix').css('display', 'none');
 				} else {
 					$(this).parents('div[id="Grid"]>.mix').css('display', 'inline-block');