drop test file for unsupported Keynote version

I don't remember why I added it anyway. And it will break build with
(system) libetonyek >= 0.1.4, as the format is supported by that
version.

Change-Id: I4b69af8ae637eae2ff1f7342eaa6a7e8580c3af4
Reviewed-on: https://gerrit.libreoffice.org/20790Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>
(cherry picked from commit c28aad62)