Add missing packet header label to packet index

Author: carlbennett

src/templates/Packet/Index.phtml

@@ -72,7 +72,7 @@ require('./header.inc.phtml');
           <table>
             <thead>
               <tr>
-                <th class="left"></th>
+                <th class="left">Packet</th>
                 <th class="left">Author</th>
               </tr>
             </thead><tbody>