[dev] Small fix for nag

[Jeroen Huinink]

The error:
Notice: Undefined variable: alarm in C:\htdocs\horde.head\nag\task.php on
line 183

gets fixed by:
Index: task.php
===================================================================
RCS file: /repository/nag/task.php,v
retrieving revision 1.39
diff -r1.39 task.php
183c183
<                                              $task_category, $alarm);
---
>                                              $task_category, $task_alarm);

Regards,
Jeroen