Remove tether_apndata for Sasktel

Device has second APN (inet.stm.sk.ca) is being used for hot spot/tethered data.
SaskTel has moved to a single APN on devices (pda.stm.sk.ca).

BUG=25064017
Change-Id: I5ba1f9e7c3b54cf8e8681a289693aba0ac584296
2 files changed