fix: rename internal variable fcn to avoid shadowing and lint errors

[anandkaranubc]

Resolves none.

Description

What is the purpose of this pull request?

This pull request:

• Renames the internal fcn variable to f, to avoid shadowing and resolve lint warnings.

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves none

Questions

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No.

Other

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No.

Checklist

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• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[anandkaranubc]

Credits to @Eternity0207 for spotting this and coming up with a fix.

Reference PR: #6245

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/napi/binary	$\color{green}154/154$ $\color{green}+100.00\%$	$\color{green}5/5$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}154/154$ $\color{green}+100.00\%$
math/base/napi/quaternary	$\color{green}156/156$ $\color{green}+100.00\%$	$\color{green}5/5$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}156/156$ $\color{green}+100.00\%$
math/base/napi/quinary	$\color{green}157/157$ $\color{green}+100.00\%$	$\color{green}5/5$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}157/157$ $\color{green}+100.00\%$
math/base/napi/ternary	$\color{green}155/155$ $\color{green}+100.00\%$	$\color{green}5/5$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}155/155$ $\color{green}+100.00\%$
math/base/napi/unary	$\color{green}153/153$ $\color{green}+100.00\%$	$\color{green}5/5$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}153/153$ $\color{green}+100.00\%$

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

[kgryte]

LGTM