adding search-button class to old search form

templates/search.html

@@ -9,6 +9,6 @@
     {{ search_form.appver }}
     {{ search_form.platform }}
   </span>
-  <input id="search-button" type="image" class="submit" title="{{ _('Search') }}"
+  <input id="search-button" type="image" class="submit search-button" title="{{ _('Search') }}"
          src="{{ media('img/zamboni/global/btn-search.png') }}">
 </form>