Add a missing taglib to homePager.jsp

The missing taglib is confusing coverity a bit,
and I think that it's a good practise to add it
anyway.

airsonic-main/src/main/webapp/WEB-INF/jsp/homePager.jsp

@@ -1,4 +1,5 @@
 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
 <table>
     <tr>
         <c:if test="${not empty model.musicFolder}">
@@ -76,4 +77,4 @@
                 <a href="javascript:playShuffle()"><img src="<spring:theme code="shuffleImage"/>" alt="">&nbsp;<fmt:message key="home.shuffle"/></a></td>
         </c:if>
     </tr>
-</table>
+</table>