Don't save media sharing fallback bodies in the db

Made the logic in QML complicated and the links were duplicated in the
database (we have a media url attribute).
3 jobs for refactor/media-body-in-db in 5 minutes and 6 seconds (queued for 33 minutes and 39 seconds)
Status Job ID Name Coverage
  Test
passed #64404
build

00:02:29

passed #64402
clazy

00:01:50

passed #64403
qmllint

00:00:46