Author: Mark Nelson
MDL-39957 course: replaced the course_category_deleted legacy event
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f326c5b4f44dfa8e30816f1976e41f9431d3fe69
http://github.com/moodle/moodle/commit/f326c5b4f44dfa8e30816f1976e41f9431d3fe69
+ 2.6 en [eventcoursecategorydeleted,core]