fdo#75364 flat style and 3d style were swapped

Change-Id: I929f8f63e8017727595be30f4e56f3aabeec2b1e
Reviewed-on: https://gerrit.libreoffice.org/9553
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>