Fix LuaCs selecting the wrong assembly for MacOS

Author: evilfactory

Barotrauma/BarotraumaShared/SharedSource/LuaCs/ModUtils.cs

@@ -108,7 +108,7 @@ public static bool IsMainThread
             public static readonly Platform CurrentPlatform =
 #if WINDOWS
                 Platform.Windows;
-#elif MACOS
+#elif OSX
                 Platform.MacOS;
 #elif LINUX
                 Platform.Linux;