Set Calls.NEW to 0 if the voicemail is read.

Newly inserted read voicemails were notifying because the Calls.NEW flag was
set to true. Add logic to set it to false if the Voicemails.IS_READ flag
is set to true.

Bug: 21085233
Change-Id: Ibb969de54684578473b7617095b63dd04c953abc
1 file changed