Also - make sure the page we are updating belongs to the lesson.

* course_delete_module was calling delete_event
* Also fix missing inclusion from 379cd2d4

It was getting the cm event with the wrong id and calling
deprecated functions

There are still a lot of deprecated uses in core
that we should move to the new counterparts ASAP.

This commit just fixes the 2 deprecated uses that
are causing unit tests to fail.

Conflicts:
	admin/oacleanup.php