Create moodle_postgres_set_rawgrade_equal_finalgrade.sql

Sets all mdl_grade_grades.rawgrade values to that of mdl_grade_grades.finalgrade value where the rawgrade value is empty and the finalgrade value is not empty. This does not affect the 'course' or 'category' items as those are constantly in flux. This is for the entire collection of courses but can easily be modified to affect a single course by adding 'i.courseid = <course id>' to the where statement.