Fix contact birthday sync for GMT+n users

* We look at the hour offset, and move forward a day if >= 12
* This is, unfortunately, the best we can do, since we're not
  given very good information by the server
* This should work for everyone that isn't in GMT+12/1314
  (who are broken now anyway)

Bug: 6472405
Change-Id: I0c763fdd67e1a5601a0780f8482fb255fcc4e6de
2 files changed