Eleven: Fix play indicator in queue list view.

The mSourceId and mSourceType fields of QueueSongAdapter are no longer updated.
This meant that the showNowPlayingIndicator function would never return true.
This change simply removes these unused fields.

Signed-off-by: Craig G <kraigs.android@gmail.com>
Change-Id: I12fe6c78c4d95dd05a0896be523d1ea42bbd7f03