Fixed Thok MD2s don't face the camera

Here I am, screwing around with trying to make an MD2 model for the Thok myself, and then I notice it's invisible. Frustrated, I decide to just play the game normally. Then I noticed the Thok MD2 from Tails spinning while facing towards me after beating the first boss once again. Whoop whoop, YouTube link. (Don't mind the odd shape of the Thok, I messed up the texture while recording that, getting the sides of it invisible.) And other things "without directions" (monitors, end signs, etcetera) do face the camera, so I personally qualify this as a bug. (Who would want directional Thok MD2s, anyway?)

I've fixed this here: https://github.com/Sryder13/SRB2/commit/781dd16fa6c3a5174fe35961d2296e9f509c4205

Fix has been added to private trunk.