Removed "long" integer literals where applicable in some files of xmloff module

Change-Id: I96f44c00583a95f8a0ae6acf25f439936433ac08
Reviewed-on: https://gerrit.libreoffice.org/35798Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>