Update classes/services/notifications/class.tx_caretaker_AbstractNotificationService.php

Enable notifications also when called via the scheduler BE module.
In this case the BE user wont be a _cli* user but some normale BE user with rights to use the scheduler module

Disabling CLI notifications during scheduler runs ins already implemented by github commit #4d3d9c5dfad401547a20143979544bf78020b7a8