MDL-43709 Forum: Reset forums not working with multiple forum types
MDL-43709 Forum: Reset forums not working with multiple forum types

The SQL being generated from the selected forum types on the course reset
form was using AND, resulting in never matching anything if more than one
forum type was selected for resetting (as each forum can only have one
type).  This should use $DB->get_in_or_equal() to generate sensible SQL.

dilawar/moodle