Update js-beautify to 1.15.1

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Unit Test Results

    1 files      1 suites   0s :stopwatch: 275 tests 272 :heavy_check_mark: 0 :zzz: 0 :x: 3 :fire: 275 runs  269 :heavy_check_mark: 0 :zzz: 3 :x: 3 :fire:

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Results for commit 06de9ab0.

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