java: last statement in finalize() method should be call to super.finalize()

Change-Id: I1785c6cef1fe7c1990207a76c263cff388cbb7e1
Reviewed-on: https://gerrit.libreoffice.org/12375
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>