Make sure the default is for kerning to be enable, and honor the setting
to disable it.

This also updates the expectations for chart2_xshape tests for file that
had kerning disabled and was previously ignored.

Change-Id: Icf6bb75e71cae43868fba323ca3c61e4a3e81523
Reviewed-on: https://gerrit.libreoffice.org/34169Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>