Write tile coord if it is unchanged not the file path to the base tile.

common/basetilecreator.go

@@ -169,7 +169,7 @@ func (btc *BaseTileCreator) CreateTile(x, z int16, i, j int) (bool, error) {
 		return true, SaveAsPNGAtomic(path, image)
 	}
 
-	log.Printf("File %s does not change.\n", path)
+	log.Printf("(%d, %d) is unchanged.\n", x, z)
 
 	return false, nil
 }