Fix so task name can really contain all from a-z0-9_- characters (#1488941)

Aleksander Machniak

2013-03-10 8b771646fadcde0abb27c2218a45942b95734838

 program/include/rcmail.php

@@ -123,7 +123,7 @@
   */
  public function set_task($task)
  {
    $task = asciiwords($task);
    $task = asciiwords($task, true);

    if ($this->user && $this->user->ID)
      $task = !$task ? 'mail' : $task;