Fixes shower curtains not showing above mobs.

[TerryTehCoder]

About the Pull Request

Adjusts the plane of shower curtains to 2 (Mob Plane) when closed so that their layer actually works and puts them above Carbons when closed.

Why It's Good For The Game

You would not Stand on your shower curtains at home... why would you do it at work?

Resolves #1613, needs review from someone with more experience using planes and layers to verify this is acceptable usage.

Changelog

🆑
Fixed: Shower curtains now show above mobs when closed, rather than the other way around with mobs standing on the curtains.
/:cl:

[checkraisefold]

This is acceptable though I foresee unknown bugs happening down the line that may need to be fixed. SHOULDN'T happen looking at the layers
It's ridiculous that we have separate planes anyway this shit is so stupid, everyone else has 1 game-wide plane

[TerryTehCoder]

What baffles me the most is that there was no major discrepancies between this file and bays version of curtain code. So either they handle it somewhere else, or curtains are just not something they ever fixed.