Format bytes in info worker page (#1752)

distributed/bokeh/templates/worker.html

@@ -17,7 +17,7 @@ <h2 class="subtitle"> In Memory </h2>
             {% for ts in ws.has_what %}
             <tr>
               <td> <a href="../task/{{ url_escape(ts.key) }}.html">{{ts.key}}</a></td>
-              <td> {{ts.nbytes}} </td>
+              <td> {{format_bytes(ts.nbytes)}} </td>
             </tr>
             {% end %}
           </table>