block/skull.go: Remove pointless conversion of cube.Face to cube.Dire…

…ction

server/block/skull.go

@@ -116,10 +116,8 @@ func (s Skull) EncodeBlock() (string, map[string]interface{}) {
 // allSkulls ...
 func allSkulls() (skulls []world.Block) {
 	for _, t := range SkullTypes() {
-		for _, f := range cube.HorizontalFaces() {
-			// A direction of -2 and -1 isn't actually valid, but when encoding the block these are encoded as 0 and 1. We
-			// can't otherwise represent this properly in an Attachment type.
-			skulls = append(skulls, Skull{Type: t, Attach: WallAttachment(f.Direction())})
+		for _, d := range cube.Directions() {
+			skulls = append(skulls, Skull{Type: t, Attach: WallAttachment(d)})
 		}
 		skulls = append(skulls, Skull{Type: t, Attach: StandingAttachment(0)})
 	}