[openstreetmap/openstreetmap-website] OSM map no longer loads in IE11 (Issue #3387)

[RemySijbom]

### URL

https://www.openstreetmap.org/

### How to reproduce the issue?

1: start IE11
2: open https://www.openstreetmap.org/
3: the map doesn't load

### Screenshot(s) or anything else?

The HTML console shows a syntaxis-error (index-082bdf22ac1acb0b592af44c07db66f0510f4716d509dd00e3f126a4c4365396.js (8,249)). 

The issue started this week. 

![OSM website](https://user-images.githubusercontent.com/95346586/144212893-85dcde64-a033-4091-93a2-1ac70971d1bd.png)
![OSM syntaxiserror HTML console](https://user-images.githubusercontent.com/95346586/144213056-90c167fd-8b10-4983-ad38-b04f3b980b96.png)




### Which browsers are you seeing this problem on?

_No response_

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https://github.com/openstreetmap/openstreetmap-website/issues/3387
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