Remove unrequired global calls.

classes/structure.php

@@ -689,7 +689,7 @@ class mod_attendance_structure {
      * @return array
      */
     public function get_users($groupid = 0, $page = 1) {
-        global $DB, $CFG;
+        global $DB;
 
         $fields = array('username' , 'idnumber' , 'institution' , 'department');
         // Get user identity fields if required - doesn't return original $fields array.

renderer.php

@@ -479,7 +479,6 @@ class mod_attendance_renderer extends plugin_renderer_base {
      * @return string
      */
     private function construct_take_controls(attendance_take_data $takedata) {
-        global $CFG;
 
         $controls = '';
         $context = context_module::instance($takedata->cm->id);