Consider roaming when auto switch

- Always prefer HOME over Roaming + Roaming user enabled.
- Roaming + Roaming user disabled == no service.

Fix: 306488039
Test: manual fake roaming and confirm all combination of cases.
Test: daily test following
https://docs.google.com/spreadsheets/d/1fw_ONvemAFVHS7c4nLUv6rSQ8uINBQnYDWtMpV-M9yw/edit#gid=0
tracking with b/310043079

Change-Id: I4157a1c5cc09afb7e6bc64edbd2b99db584e5a1f