Resolves an issue where IPv4 traffic would not work when eth0 is connected (i.e. usb-ethernet adapter over OTG). The static route for usb0 precedes the DHCP route for eth0. Only IPv6 traffic would work, but not IPv4 until the metric for usb0 is increase and thus lowered in priority. If no eth0 is plugged in, internet works fine over usb0.
