HFP-3825 Do not send xAPI completed on resume

[otacke]

When merged in, will not trigger an xAPI completed statement if the Course Presentation is resumed and the user stopped on the summary slide.

Course Presentation triggers an xAPI completed statement whenever the user opens the summary slide. When he/she closed the Course Presentation and later resumed, Course Presentation would recreate the previous state including the summary slide being opened and sending out an xAPI completed statement again. That feels wrong though and might mess with learning record stores or gradebooks which might register this as a new attempt.