Remove auto-save notification

Don't see the need for this... autosave drafts is important precisely
when the user is NOT aware of it, so they will not change their behavior
on the basis of knowing when the message is being auto-saved.

imp/lib/Ajax/Application/Handler/Draft.php

@@ -113,10 +113,6 @@ protected function _draftAction($action)
             }
 
             switch ($action) {
-            case 'autoSaveDraft':
-                $GLOBALS['notification']->push(_("Draft automatically saved."), 'horde.message');
-                break;
-
             case 'saveDraft':
                 if ($GLOBALS['prefs']->getValue('close_draft')) {
                     $imp_compose->destroy('save_draft');