Fix sorting issues with remote and resume controls

- Sort paused controls by last active time, regardless of whether they
are local or remote sessions
- Ensure resume controls have isPlaying=false
- Add test for ordering

Fixes: 198099352
Fixes: 192259825
Test: manual
Test: atest com.android.systemui.media
Change-Id: Ie5717cbf2dae3701e0ebff6b693a3bb5640accf5