Wrong capability checked in get_all_instances_in_course in datalib

When a teacher clicks on the Quiz link in the Activities block, quizzes in hidden sections do not display.

mod/quiz/index.php calls `get_all_instances_in_course("quiz", $course)` at HEAD line 42.

in lib/datalib.php both functions get_all_instances_in_course() and get_all_instances_in_courses() call `has_capability('moodle/course:viewhiddencourses', get_context_instance(CONTEXT_COURSE, $course->id), $userid)` at HEAD lines 1257 and 1321 when $includeinvisible is not passed as true.

Teachers with moodle/course:viewhiddenactivities or moodle/course:viewhiddensections should be eligible to see the quizzes regardless of the moodle/course:viewhiddencourses permission, so perhaps the get_all_instances_in_course() call needs to pass the user and includeinvisible flag or the permissions check in the lib/datalib.php functions should be changed to one of these other permissions.