save mimetype in DB
save mimetype in DB

We don't need the hash in the DB, but for new pastes we use it.
Otherwise fallback to old method.
Signed-off-by: Florian Pritz <753f544d2d01592750fb4bd29251b78abcfc8ecd@xssn.at>

Bluewind/filebin,jreinert/filebin,Bluewind/filebin,jreinert/filebin,jreinert/filebin,Bluewind/filebin,Bluewind/filebin,jreinert/filebin,jreinert/filebin,Bluewind/filebin,jreinert/filebin