reset direction under moveto when going forward or backward

src/main.lua

@@ -308,11 +308,13 @@ local function moveto(x,y,cx,cz,direction)
     while x ~= cx or y ~= cz do
         if cx < x then -- x
             center(direction)
+            direction = 0
             cx = cx + 1
             move("forward")
         end
         if cx > x then
             center(direction)
+            direction = 0
             cx = cx - 1
             move("back")
         end