filter config: fix MIME types for MacWrite and FreeHand

The type "application/macwrite" does not appear to exist, but
"application/macwriteii" is officially registered at IANA:
https://www.iana.org/assignments/media-types/application/macwriteii

For Freehand the "application/x-freehand" has just 6 hits on Google
whereas Adobe recommends "image/x-freehand" on
https://www.adobe.com/support/config.html

Change-Id: I36d498888601778b1359ff58ee60b25af436a74e
Reviewed-on: https://gerrit.libreoffice.org/6639
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>
Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>