Understand tags with "*" values

for searching by tags. E.g. to find this preset

```
    "disused/amenity": {
        "fields": [
            "disused/amenity"
        ],
        "geometry": [
            "point",
            "vertex",
            "area"
        ],
        "tags": {
            "disused:amenity": "*"
        },
        "matchScore": 0.05,
        "searchable": false
    },
```