Fix for broken wifi tethering on Google phones updated to 8.1

Hi all, just wanted to post a fix for the broken wifi tethering on Nexus devices post the 8.1 update.

This is from the offical Google big thread found here: https://issuetracker.google.com/issues/68450197

After changing the APN Type string from 'default, supl' to <blank> for the internet APN in mobile network settings tethering unexpectedly works again. Not clear how these settings got there (part of the 8.1.0 upgrade?), but it works for now. Just for the record: This was on Australia's Telstra network.