Modified function getCmPerPixel to es6 funcion in src/util/ImageUtil.js

[kabuur]

…til.js

Fixes #598 (<=== Add issue number here)

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[gitpod-io]

[kabuur]

Modified function to es6 funcion in src/util/ImageUtil.js]

[jywarren]

Here I think it could be const perhaps? And on line 6 as well, if I understand right!

Thank you for your help!!

[jywarren]

Hi @kabuur would you mind making this change and then hopefully we can merge this! Thank you!

Suggested change

	let map = overlay._map;
	const map = overlay._map;