try to turn off backface culling properly

Bucket_Game-branches/mdskeleton-public-licensed-190821-vs-190817/mods/codermobs/codermobs/mdskeleton.lua

@@ -36,7 +36,6 @@ mobs_param = {
 
     add_egg   = true               ,
     egg_image = "default_dirt.png" ,
-    backface_culling = false,
 }
 
 -- ===================================================================
@@ -68,7 +67,7 @@ mobs_param.core_param = {
     collisionbox   = { -0.40, -0.01, -0.40, 0.40, 1.80, 0.40 } ,
     visual         = "mesh"                                    ,
     -- drawtype       = "front"                                   ,
-    -- backface_culling = false,
+    backface_culling = false,
     mesh           = msname .. ".x"                            ,
     textures       = { msname .. "_mesh.png" }                 ,
     stepheight     = 1.2            ,