get_my_courses doesn't properly generate the user accessdata when userid != $USER->id

Problem:
When an administrator visits a user's profile page it can sometimes load a course list different from what the user sees.

How to duplicate:

• Override the permission moodle/course:view on a course
• View any user profile not enrolled in the course and without a site level role
  • notice that the above course is not in the user's courses
• login as the user and view the user profile
  • notice the above course now appears

MDL-8902 This is a better solution than the attached patch then update user/view.php and replace get_my_courses with get_my_enrolled_courses