Update GeolocateAction.js

[klaus139]

I changed the var keywords into let and const

For #1086

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[jywarren]

Hello, thank you for your contribution, what issue is this for, can you please link to it? Are you sure someone else has not already claimed it? Thank you!

[TildaDares]

Amazing work @klaus139. Thank you!

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[jywarren]

Great work! Thank you!!!