MDL-43460 calendar: Decode event description links on restore

backup/moodle2/restore_course_task.class.php

@@ -124,6 +124,7 @@ class restore_course_task extends restore_task {
         $contents = array();
 
         $contents[] = new restore_decode_content('course', 'summary');
+        $contents[] = new restore_decode_content('event', 'description');
 
         return $contents;
     }

backup/moodle2/restore_stepslib.php

@@ -2223,6 +2223,7 @@ class restore_calendarevents_structure_step extends restore_structure_step {
         $result = $DB->record_exists_sql($sql, $arg);
         if (empty($result)) {
             $newitemid = $DB->insert_record('event', $params);
+            $this->set_mapping('event', $oldid, $newitemid);
             $this->set_mapping('event_description', $oldid, $newitemid, $restorefiles);
         }