Setting all days when repeat checkbox is turned on.

Also remembering the selected days when repeat is turned off. When repeat is
turned on, any previously selected days will be set. If previous does not exist
all days will be selected. The previous is only in effect for the lifetime of
the activity.

Bug: 7318257, 7315850
Change-Id: Idf89d29a2ee47a37b51ac5c7a916f62074339ead