optimized the js api use of counting_sort chapter for Math.max()

[Asashishi]

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program output

计数排序（无法排序对象）完成后 nums = [ 0, 0, 0, 1, 1, 2, 2, 2, 4, 4 ]
计数排序完成后 nums1 = [ 0, 0, 0, 1, 1, 2, 2, 2, 4, 4 ]

[krahets]

Thank you for the PR!