[openstreetmap/openstreetmap-website] Nominatim starts to be more strict regarding viewbox parameter (Issue #4138)

[mtmail]

### URL

https://www.openstreetmap.org/search?query=banana#map=0/-41/-108

### How to reproduce the issue?

1. Zoom out until more than one "world" is displayed. 2. Search for a place.

Newest Nominatim (version 5, master) returns an error
```
curl 'https://dulcy.openstreetmap.org/search.php?q=london&format=xml&viewbox=-300,-90,300,90'
<error>
    <code>400</code>
    <message>Bounding box coordinates invalid.</message>
</error>
```

Older Nominatim was more forgiving
```
curl 'https://vhagar.openstreetmap.org/search.php?q=london&format=xml&viewbox=-300,-90,300,90'
<searchresults timesta[....]opyright' querystring='london' viewbox='-180,-90,180,90' exclude_place_ids='307[...]
```

cc @lonvia 

### Screenshot(s) or anything else?

![image](https://github.com/openstreetmap/openstreetmap-website/assets/3727288/359ac321-0b5b-471b-9625-13f41c06ad9d)


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