Background Tab was replaced with Area Tab on Paragraph Style
Dialog. With that we lost the opportunity to set character background
color. So bring back the Background tab as Highlighting.

(cherry picked from commit 9874db20)

Change-Id: I29925f72816fbd27243060231d551e6590f1b9d9
Reviewed-on: https://gerrit.libreoffice.org/16324Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
Tested-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>