Use call_helper() on Sources/Reminder.php

Signed-off-by: Suki <suki@missallsunday.com>
Use call_helper() on Sources/ReportedContent.php

Signed-off-by: Suki <suki@missallsunday.com>
Use call_helper() on Sources/SplitTopics.php

Signed-off-by: Suki <suki@missallsunday.com>