CRM-15291 fix - Remove CRM_Event_Form_ManageEvent_ScheduleReminders

https://issues.civicrm.org/jira/browse/CRM-15291
minor changes
tpl placeholder fix
Merge pull request #4644 from monishdeb/CRM-15291-fix

CRM-15291 fix - Remove CRM_Event_Form_ManageEvent_ScheduleReminders