Fix showing calc/draw types in some file pickers

Having the same UIName for several filters, causes some
file pickers (gtk & generic) to drop the whole group.

Change-Id: I6d18a751cb77a6a83e8e2a46338e41b7c72180ff
Reviewed-on: https://gerrit.libreoffice.org/10730
Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>
Reviewed-by: Andras Timar <andras.timar@collabora.com>