Messages in trash should be permanently deleted upon deletion

* We were always using "DeletesAsMoves", which is wrong for the
  trash folder
* Handle difference in the use of "DeletesAsMoves" in Exchange 2003
  and later versions (sigh; reversed defaults, etc.)

Bug: 5703706
Change-Id: Id0f567f5d48a0976b0ce2226b8c1a87debc25cc4
1 file changed