Media - Leave playing media in QS

Previously, with resumption off, when dismissing a playing media
player from QQS would also remove the player from QS, leaving the user
with no notification to control the media. Only remove players from QS
when the media is paused.

Fixes: 160425592
Test: atest MediaDataFilterTest
Test: manual, switch resumption setting off, play media, and dismiss
from QQS

Change-Id: Ia7c9a8d9b100506f2c12ef2d14e4a952e151bd05