fix(browser): patchTimer cancelAnimationFrame

[tom5760]

Call cancelAnimationFrame instead of cancelMicroTaskAnimationFrame.

Fixes #326 and Leaflet/Leaflet#4588

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[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[tom5760]

I signed it!

[googlebot]

CLAs look good, thanks!

[googlebot]

CLAs look good, thanks!

[kaynz]

Waiting for a merge 👍

@Mlaval

[marclaval]

@mhevery please have a look

[kaynz]

@mhevry Will there be a release soon with this bugfix? This bug affects every leaflet user and is really breaking the map =/