Similarly to commit 697173f6, we have to
preserve the correct content-type which is not the same for PPTX and PPTM.

This commit also changes sdfilt.component to use the constructor feature.

Change-Id: I4b334540ec07a53d308e6b9dd6403294842bddf8
Reviewed-on: https://gerrit.libreoffice.org/40195Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>
Reviewed-on: https://gerrit.libreoffice.org/40265Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jan Holesovsky <kendy@collabora.com>