Auto-update DIRECTORY.md

Author: github-actions

DIRECTORY.md

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 ## Backtracking
+  * [AllCombinationsOfSizeK](https://github.com/TheAlgorithms/Javascript/blob/master/Backtracking/AllCombinationsOfSizeK.js)
   * [GeneratePermutations](https://github.com/TheAlgorithms/Javascript/blob/master/Backtracking/GeneratePermutations.js)
   * [KnightTour](https://github.com/TheAlgorithms/Javascript/blob/master/Backtracking/KnightTour.js)
   * [NQueen](https://github.com/TheAlgorithms/Javascript/blob/master/Backtracking/NQueen.js)