Use autocomplete widget for course category selector

test 1 (edit course settings) edit course settings check that course category field uses autocomplete widget change course category field and save form check that category has been changed test 2 (request course creation) request a course (<url>/course/request.php) check that course category field uses autocomplete widget test 3 (upload courses) go to site administration > courses > upload courses upload a csv file to access to the second step (attached upload_course.csv can be used) check that course category field uses autocomplete widget test 4 (edit database enrol settings) go to site administration > plugins > enrolments > manage enrol plugins edit external database settings check that course category field uses autocomplete widget test 5 (add new event to calendar) go to the calendar add a new event select "category" in "type of event" check that category field uses autocomplete widget test 6 (add/edit course category) go to site administration > courses > manage courses and categories click on "create a new category" button check that parent category field uses autocomplete widget test 7 (delete course category) go to site administration > courses > manage courses and categories use "actions menu" on a non-empty category, and select "delete" option check that move into field uses autocomplete widget test 8 (cohorts) go to site administration > users > cohorts click on "Add new cohort" tab check that context field uses autocomplete widget test 9 (copy course) access to a course select "Copy course" from the main menu course check that course category field uses autocomplete widget   actual result (before the patch): course category field uses default drop-down list ( select tag in HTML) expected result (after the patch): course category field uses autocomplete widget, with possibility to search some text in drop-down list