Fix incorrect liquid backface culling

mods/ITEMS/mclx_core/init.lua

@@ -41,7 +41,7 @@ flowing.special_tiles = {
 	},
 	{
 		image="default_river_water_flowing_animated.png",
-		backface_culling=true,
+		backface_culling=false,
 		animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=4.0}
 	},
 }