Remove $modSettings['integrate_autotask_include'] 

$modSettings['integrate_autotask_include']  was introduced as a way to allow adding functions to AutoTask() without having to edit the ScheduledTasks.php file, however, the new "callable" column makes $modSettings['integrate_autotask_include']  completely redundant.

With this you only have to include a string in the callable column, no need to validate it by adding it to $modSettings['integrate_autotask_include'] too.

Also, changed the priority of what is been called first:

- callable
- The normal scheduled_taskName
- The task name

Signed-off-by: Suki <suki@missallsunday.com>