[openstreetmap/openstreetmap-website] Iframe map are not showing tiles for the style tracestracktopo (Issue #4273)

[Binnette]

### URL

https://www.openstreetmap.org/#map=14/45.8360/6.8186&layers=P

### How to reproduce the issue?

1. Open osm.org
2. Select the layer "Tracetrack topo"
3. Click on Share button
4. In the panel, click on HTML button
5. Copy the html code
6. Paste the code in a website or local html file
7. Open the website/file in a web browser
8. BUG! the map is empty (no tiles are shown)

### Screenshot(s) or anything else?

Example with "Tracetrack topo" layer:

![image](https://github.com/openstreetmap/openstreetmap-website/assets/6597721/63d07a5d-fb9e-49a8-add7-8db9765e9e15)

<iframe width="425" height="350" src="https://www.openstreetmap.org/export/embed.html?bbox=6.746978759765626%2C45.8090593688804%2C6.890316009521485%2C45.862878930546415&layer=tracestracktopo&marker=45.83597565614144%2C6.818647384643555" style="border: 1px solid black"></iframe><br/><small><a href="https://www.openstreetmap.org/?mlat=45.8360&mlon=6.8186#map=14/45.8360/6.8186&layers=P">View Larger Map</a></small>


Example with "default Mapnik" layer:

![image](https://github.com/openstreetmap/openstreetmap-website/assets/6597721/559ed479-89df-4cce-b372-3c69b6d5c900)

<iframe width="425" height="350" src="https://www.openstreetmap.org/export/embed.html?bbox=6.746978759765626%2C45.8090593688804%2C6.890316009521485%2C45.862878930546415&layer=mapnik&marker=45.83597565614144%2C6.818647384643555" style="border: 1px solid black"></iframe><br/><small><a href="https://www.openstreetmap.org/?mlat=45.8360&mlon=6.8186#map=14/45.8360/6.8186">View Larger Map</a></small>

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