Changes needed for propagating error messages when MMS message is received
- Fill MMS message headers according to properties on mmsReceived.
- Fix MMS message type on mmsReceived.
- Remove some spaces/newlines to have consistent formating.
- Add changes descriptions into debian changelog
Note: This is the same as https://github.com/ubports/telepathy-ofono/pull/20, with !28 (merged) but cherry-picked onto the main (focal) branch.