Fix bug where search does not work for URL path /search/

If a tech docs site is being served by nginx the path /search will be
redirected to /search/. This commit updates the test of whether the
browser is on the search page to handle this.

lib/assets/javascripts/_modules/search.js

@@ -31,7 +31,7 @@
       changeSearchLabel()
 
       // Only do searches on the search page
-      if (window.location.pathname === '/search') {
+      if (window.location.pathname.match(/\/search(\/|\/index.html)?$/)) {
         $html.addClass('has-search-results-open')
 
         if (window.location.search) {