Step Yeo Johnson contains an unused line

[dshemetov]

Hi, we're reusing some of your step_YeoJohnson code in epipredict and ran across an unused line of code in the YJ parameter estimation here. We looked into the original Yeo Johnson (2000) paper and found that indeed, mu_t is not needed for the estimation process, so we removed the line in our extension without issue. Figured we'd upstream the change.

[github-actions]

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