Update morgue indicator.

Created by: eswordthecat

Pomf told me to import this https://github.com/tgstation/-tg-station/pull/2242, so there you go.

If open (blue)

no content (light blue)

has a body, but no player (red)

items inside, no body (light red)

there's a body with a player connected to it (green)

Also added the icon_state (existing in the dmi but seems no one used it) of cremator when active