Use only current density to check isTablet

- Removed DeviceProfile.allowRotation and use DeviceProfile.isTablet instead, which only uses current density to calculate its value
- Reverted default allow_rotation preference handling to before ag/14234761

Fix: 203817448
Test: isTablet is set correctly in different screen sizes
Change-Id: Ic6c8dfc774e7787f62d489ad27720a7644c1e8c7
4 files changed