java: rather use @Deprecated annotation

than an empty @deprecated tag

Change-Id: I1646ce1c0c8823ac5be0153aeb8eb2b830e7ebfa
Reviewed-on: https://gerrit.libreoffice.org/12525
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>