Clean dirty state after uploading to server
Ta-wei Yen authored
Previously the dirty state is cleared by marking the voicemail as read
again. This confuses the VoicemailContentProvider. Sending a update
with no values is enough to clean the flag.

The dirty flag is used to track external changes like read flag that
should be uploaded to the server.

+ Reverts ag/1314867, the "new" column is not updatable through the
  VoicemailContentProvider

Change-Id: I17a3c50622d98397fd27dc1097c15219fcd1196c
Fixes: 30105817
22f0d6ef