Fix crossOrigin for leaflet maps

[giobber]

To make authentication by domain work with stadia maps: add option {crossOrigin: true} to L.tileLayer(..., options) or L.tileLayer.provider(...name, options)

For reference:
https://leafletjs.com/reference.html#tilelayer-crossorigin
https://docs.stadiamaps.com/authentication/#domain-based-authentication