bench: add opts for stats/base/dists/halfnormal/mean

[Lokeshranjan8]

Resolves #none.

Description

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This pull request:

• Updates the code to follow latest code conventions.

Related Issues

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This pull request has the following related issues:

• #{{TODO: add related issue number}}

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/halfnormal/mean	$\color{green}168/168$ $\color{green}+100.00%$	$\color{green}8/8$ $\color{green}+100.00%$	$\color{green}2/2$ $\color{green}+100.00%$	$\color{green}168/168$ $\color{green}+100.00%$

The above coverage report was generated for the changes in this PR.

[kgryte]

@Lokeshranjan8 Thanks for opening this PR; however, the existing inline use of options is also fine and, in this case, does not need to be changed. As such, I'm going to go ahead and close this PR.