[openstreetmap/openstreetmap-website] Use baselayerchange/overlaylayerchange instead of layeradd/layerremove (PR #5474)

[mmd]

@AntonKhorev 's comment wasn't exactly clear to me either. I think it's the following. Note that once you change the layer in the URL, the share link "layer" attribute is updated accordingly:

![Peek 2025-01-14 22-58](https://github.com/user-attachments/assets/9b801345-a8e2-4a3b-ae1b-11129d9f836a)


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