Removed duplicate HTML class attribute.

htroot/yacysearch.html

@@ -81,7 +81,7 @@ Use the RSS search result format to add static searches to your RSS reader, if y
     <div class="input-group-btn">
        <button id="Enter" name="Enter" class="btn btn-default" type="submit">search</button>
        #(resortEnabled)#::
-       <a id="resortCached" class="btn btn-default" style="visibility: hidden;" class="btn btn-default" role="button" href="#[url]#" 
+       <a id="resortCached" class="btn btn-default" style="visibility: hidden;" role="button" href="#[url]#" 
        		title="Refresh sorting. Depending on their rank, some results fetched in background may then appear on this page.">
         	<span  class="glyphicon glyphicon-sort"></span>
        </a>