Medium sized improvements to bot-list and task-list

appengine/swarming/elements/res/imp/tasklist/task-list.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:
 
     <task-list>
 
@@ skipping 35 matching lines @@
       task-filters {
         margin-bottom: 8px;
         margin-right: 10px;
       }
       .task-list th > span {
         /* Leave space for sort-toggle*/
         padding-right: 30px;
       }
     </style>
 
-    <url-param name="sort"
+    <url-param name="s"
       value="{{_sortstr}}"
       default_value="created_ts:desc">
     </url-param>
 
     <swarming-app
       client_id="[[client_id]]"
       auth_headers="{{_auth_headers}}"
       permissions="{{_permissions}}"
       signed_in="{{_signed_in}}"
       busy="[[_busy]]"
@@ skipping 291 matching lines @@
         return task.tagMap[col];
       },
 
       _taskClass: function(task) {
         return this.stateClass(this._column("state", task));
       }
     });
   })();
   </script>
 </dom-module>