Scaled bullet points aren't centered in PPT, so padding needs to be added
to get them to the correct position.

Change-Id: I61509dd43ef9cd697dcbc3cabbf58a21d625ddec
Reviewed-on: https://gerrit.libreoffice.org/46994Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>