Medium sized improvements to bot-list and task-list

appengine/swarming/elements/res/imp/botpage/bot-page.html

 <!--
   Copyright 2016 The LUCI Authors. All rights reserved.
   Use of this source code is governed under the Apache License, Version 2.0
   that can be found in the LICENSE file.
 
   This in an HTML Import-able file that contains the definition
   of the following elements:
 
     <bot-page>
 
@@ skipping 262 matching lines @@
                   <td>[[event.human_ts]]</td>
                   <td><a target="_blank" href$="[[_taskLink(event.task_id)]]">[[event.task_id]]</a></td>
                   <td>
                     <a target="_blank" href$="[[_luciLink(event.version)]]">[[_shorten(event.version,'8')]]</a>
                   </td>
                 </tr>
               </template>
             </tbody>
           </table>
         </template>
-        </div>
       </div>
     </swarming-app>
 
     <paper-dialog id="prompt" modal on-iron-overlay-closed="_promptClosed">
       <h2>Are you sure?</h2>
       <div>Are you sure you want to [[_dialogPrompt]]?</div>
       <div class="buttons">
         <paper-button dialog-dismiss autofocus>No</paper-button>
         <paper-button dialog-confirm>Yes</paper-button>
       </div>
@@ skipping 165 matching lines @@
       },
 
       _toggleState: function() {
         this.set("_show_state", !this._show_state);
       }
 
     });
   })();
   </script>
 </dom-module>