Disabled disposals auto-routing for packages.

For some reason package wrapped objects were set to auto-reroute to disposals, I can't think a good reason for this to happen but i can think of a bad one: people's mail ends up getting lost to a murder room due to someone else's neglect/incompetence - probably one of the main reasons the mail room doesn't get used very often.

So what will happen now is that packages that are put on the conveyor without a destination will loop back around and come back out the mail chute until a cargo tech works out how to use a destination tagger
Merge branch 'master' of https://github.com/tgstation/-tg-station into nopackageautodivert
Merge pull request #941 from Malkevin/nopackageautodivert

Disabled disposals auto-routing for packages.