Change: Remove disable_unsuitable_building setting

This setting is no longer useful, as you can now always build roads,
canals, etc.

src/vehicle.cpp

@@ -1792,7 +1792,6 @@ bool CanBuildVehicleInfrastructure(VehicleType type, byte subtype)
 	assert(IsCompanyBuildableVehicleType(type));
 
 	if (!Company::IsValidID(_local_company)) return false;
-	if (!_settings_client.gui.disable_unsuitable_building) return true;
 
 	UnitID max;
 	switch (type) {