TimerView: Remove some unused bits of code

- initialize doesn't need to call update because
  MessageView.renderExpiring() calls it immediately
- we don't need the className because that's already present on
  the el it attaches to, part of the MessageView's template.

FREEBIE

js/views/message_view.js

@@ -27,10 +27,6 @@
     });
     var TimerView = Whisper.View.extend({
         templateName: 'hourglass',
-        className: 'timer',
-        initialize: function() {
-            this.update();
-        },
         update: function() {
             if (this.timeout) {
               clearTimeout(this.timeout);