Playlist perm check should return highest course perm

[dennis531]

Version
3.22-dev

Describe the bug
The playlist perm check returns the permission of the first found course. Instead, it should return the highest permission over all courses in the following code:

studip-opencast-plugin/lib/Models/Playlists.php

Lines 313 to 324 in 8a4ccd8

	if (!$ret_perm) {
	// check if user has read access through a linked course
	foreach ($this->courses as $course) {
	if ($course->getParticipantStatus($user->id)) {
	return 'read';
	}
	if ($perm->have_studip_perm('dozent', $course->id)) {
	return 'owner';
	}
	}
	}

[tgloeggl]

duplicate of #1162