switching heuristic in Eight puzzle

heuristic.scala

// Creating a different solution with exactly the same code but a different
// ordering in my queue, so one can easily add solutions with better
// heuristic functions
def bestSolution(ordering: Ordering[(State, List[Move])]) =
  aStarSearch(PriorityQueue((initialState, List[Move]()))(ordering), Set())
 
lazy val bestSolutionManhatan: Option[List[Move]] =
  bestSolution(manhatanOrdering)
 
lazy val bestSolutionMisplaced: Option[List[Move]] =
  bestSolution(misplacedOrdering)