MDL-75292 mod_assign: Modify the 'Graded' filter query

Modifies the query used to filter graded students by removing the
condition that requires a submission to be marked as submitted. This
change allows the query to return students who have not submitted
their work but have still been graded, a scenario supported in the
assignment module.

mod/assign/gradingtable.php

@@ -323,8 +323,7 @@ class assign_grading_table extends table_sql implements renderable {
 
             } else if ($filter == ASSIGN_FILTER_GRADED) {
                 $where .= ' AND (s.timemodified IS NOT NULL AND
-                                 s.status = :submitted AND
-                                 (s.timemodified < g.timemodified AND g.grade IS NOT NULL))';
+                                 s.timemodified < g.timemodified AND g.grade IS NOT NULL)';
                 $params['submitted'] = ASSIGN_SUBMISSION_STATUS_SUBMITTED;
 
             } else if ($filter == ASSIGN_FILTER_GRANTED_EXTENSION) {