Cron script does not define the actor correctly

[wessama]

The cron task is designed to pull learner completion data based on the currently logged in $USER.

Problem is this $USER variable defaults to the "Admin User" when the task runs on the server, and no activity statements are ever returned because the actor being sent to the LRS is always going to be "Admin". I had to override this behavior to instead use the user ID passed in by Moodle when it attempts to update an activity's completion state, and I wanted to know if this was intentional behavior.

[davidpesce]

Fixed in #197