Change APNs for Slovenia mcc293

Based on historical data from Sony.
- Fixed mmsport for Si mobil mnc40
- Changed Telemach default APN mnc70
- Removed Tusmobil acquired by Telemach 2015

Test: adb shell content query --uri content://telephony/carriers --where mcc='293'
Bug: 228202500
Change-Id: I1907d729442ab139d37bc8bff2aba06cac14684a