MDL-36263 Assignment: Fix backport for counting submissions of unenrolled students

mod/assign/locallib.php

@@ -1100,8 +1100,7 @@ class assign {
                    WHERE
                         s.assignment = :assignid AND
                         s.timemodified IS NOT NULL AND
-                        s.status = :submissionstatus AND
-                        (s.timemodified > g.timemodified OR g.timemodified IS NULL)';
+                        s.status = :submissionstatus';
 
         return $DB->count_records_sql($sql, $params);
     }