Change var to const/let in local.js

[naijatechgirle]

Fixes #1308

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[naijatechgirle]

@TildaDares @cesswairimu I have worked on this task, kindly review

[7malikk]

@cesswairimu @TildaDares this looks good, could you review and merge

[TildaDares]

Amazing work @naijatechgirle. Thank you!!

[TildaDares]

Thanks for the review @7malikk!

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[7malikk]

Congratulations on merging your PR @naijatechgirle