Removed MapSurfer

[joker234]

MapSurfer isn't available anymore. I tried to remove it properly in your index.php. Please have a look if you need to change something else.

More information:

• https://github.com/leaflet-extras/leaflet-providers/pull/354#issuecomment-627505860
• https://ask.openrouteservice.org/t/mapsurfer-discontinued/1873