Remove an unused property.
Remove an unused property.

WenchaoIOS/FSCalendar,mohsinalimat/FSCalendar,f33chobits/FSCalendar,f33chobits/FSCalendar,WenchaoIOS/FSCalendar,WenchaoD/FSCalendar,mohsinalimat/FSCalendar,mohsinalimat/FSCalendar,WenchaoD/FSCalendar,mohsinalimat/FSCalendar