Predator Mask Icon Issue

[forwardslashN]

Bug Description:
Predator masks do not have a north facing direction, being just a transparency. When a predator loses a mask and someone drags it north, you can't see it anymore.

Steps to reproduce:
1. Slap a predator around to remove their mask.
2. Drag the mask north.
3. Watch the predator scratch its head in confusion as the mask seemingly ceases to exist.

[phil235]

The predator mask is still missing a proper sprite. It's reusing the sprite shown on the mob wearing the mask as its own sprite which is terrible.