Always show media recommendation on headphones connection.

- If all the resumable media age > MAX_AGE, show the media recommendations as the first card. All the existing resumable media remains as is;
- Otherwise, reactivate all the resumable media with age <= MAX_AGE to be shown, followed by the media recommendations as the last card.

Also, shorten the maximum media age from 3 hours to 30 minutes.

Fixes: 187999902
Fixes: 187943295
Test: Local builds
Test: MediaDataFilterTest
Change-Id: I40bdbb2a172de1c110edfd9a8e3a1f6521438ba3