Partial revert the `e-road` and `a-road` added in https://github.com/openmaptiles/openmaptiles/pull/1619. This PR leads to breaking the change of `network` and `ref` attributes for roads, which are not included in `osm_route_member_network_type`.
Partial revert the `e-road` and `a-road` added in https://github.com/openmaptiles/openmaptiles/pull/1619. This PR leads to breaking the change of `network` and `ref` attributes for roads, which are not included in `osm_route_member_network_type`.