[nsiguide] support overpass link when tree=*

[k-yle]

Closes #11536

I didn't add this feature at the time, beacuse I wasn't sure how we should handle features with multiple wikidata tags (for example, this one which has both brand & operator).

Currently it just picks one of the *:wikidata tags for the query. Maybe it would be better to construct a more complex query for this case?

[k-yle]

@UKChris-osm do you have an opinion about how the overpass query should be constructed for features with both brand and operator?

should the green styling require both brand[:*] and operator[:*] to be set correctly?

[UKChris-osm]

It would be handy if the green styling could be retained when an exact match is found, with perhaps a different colour for one that matches just the brand, but not operator (and vice versa) but for entries with both it can be tricky, and so in that respect it might be safter to removed the styling and go for a more basic match which we used to do, which was a name / type match.

[k-yle]

okay, updated. Here's an example of the query that's generated for presets with both brand[:*] and operator[:*]