Remove 02default_route_workaround

[Alfonso Sanchez-Beato]

02default_route_workaround removes routes that are created by rild in mako when setting up an interface for cellular data. It is currently unclear whether this is needed with latest NetworkManager version. The script might be racy and interfere with other programs that set-up routes, so we need to investigate whether the script is still needed or not, and remove it if not needed.