Added LOKit callback enums to Document.java.

Change-Id: I46b7b5fe0ceb40a89fd121082706acdf539ff916
Reviewed-on: https://gerrit.libreoffice.org/39375Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Tested-by: Tomaž Vajngerl <quikee@gmail.com>