Confusing help text in `Worker.task_count` field

[i386x]

Help text in Worker.task_count says Count of processed tasks, see

kobo/kobo/hub/models.py

Line 197 in 84434c5

task_count = models.PositiveIntegerField(blank=True, default=0, help_text=_("Count of processed tasks.<br />This is a generated field."))

But in reality it records the count of opened tasks, see

kobo/kobo/hub/models.py

Lines 208 to 209 in 84434c5

	tasks = Task.objects.opened().filter(worker=self)
	self.task_count = tasks.count()