[bugfix] fixed parameter “n” not work when set parameter “bestof” > 1

[o2363286]

[bugfix] fixed parameter “n” not work when set parameter “bestof” > 1

this PR fixed parameter “n” not work when set parameter “bestof” > 1. the key reason is that the class SamplingParams‘s clone() function will result in SamplingParams‘s post_init() function invoked again.

[github-actions]

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[youkaichao]

thanks for the fix!