Trigger parent key fixup on all folder adds

* We were only triggering the fixup when there were adds with
  parents (i.e. top-level)
* So if there are only top-level folders, we won't do the fixup
* The problem is that the fixup process also sets the mailbox
  flags, so we can end up in a situation in which the flags
  never get set

Bug: 4379394
Change-Id: I000f676782c00e988694fd5cf2c3965408e41c42
1 file changed