ifix the OpenGL UI config part

Change-Id: I931a4b618f35188e4e0cca07305ff15bbbacc20a
Reviewed-on: https://gerrit.libreoffice.org/13520
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>