Scheduler paused forever

I found if my project is paused, I can not recover my project while my project only product many on_cronjob tasks every n seconds.

My case:

Run on_start every 5 seconds.
After my project paused, my project active_tasks was filled by on_cronjob tasks.
My project _paused is "checking" forever.

Solution:

Change the code:
make cnt +1 before judging the task's type is self.scheduler.TASK_PACK

Pull Requests: #871