replaced var keyword with const

[Ranecodes]

Fixes #1086 (MapMixins.js)

I replaced the "var" keywords with "const". Kindly review my pull request and please let me know if there is anything I need to change. Thanks!

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[sainamercy]

Hi @Ranecodes. you could tag one of the mentors here to help review your PR.
My opinion, I think the screenshots are unnecessary since the file you worked on already show the changes

[TildaDares]

Amazing work @Ranecodes. Thank you!

[TildaDares]

Thank you for the review @sainamercy!

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[TildaDares]

Congratulations on merging your PR @Ranecodes 🎉

[Ranecodes]

Thanks for the review @sainamercy!

[Ranecodes]

Congratulations on merging your PR @Ranecodes 🎉

Thank you @TildaDares!