Hide some toolbar buttons in Writer by default

https://redmine.documentfoundation.org/issues/638

Change-Id: Ib46aca7eecc8552660cb6cff565e8677c443a8d5
Reviewed-on: https://gerrit.libreoffice.org/11261
Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: Thomas Arnhold <thomas@arnhold.org>