Some dirt wall tiles get a golden colouring

[akien-mga]

It's been around for some time already, but now that @hwoarangmy has tackled bug #51, fixing this bug could be a nice further enhancement before the 0.4.9 release.

See the screenshot:

Some dirt wall tiles get a funny colouring. From the screenshot, it seems to be:

• Around a newly claimed wall (though not always)
• At the ends of a wall with a width of 1 tile

[Bertram25]

This comes from the appliance of a normal on the first instance of dirt wall. I'll handle this.

[akien-mga]

Fix confirmed, thanks :-)