Hide search and back button for player and queue screens

This declutters the UI a bit with removing search from player and queue
screens, but keeping it at the main screen.

The queue screen also had an invisible back button, which did not work as
intended, so remove it as well.

Change-Id: I0bb8597b9a64b2cf133a1d01f5b8e95ea0f036aa
Signed-off-by: Alexander Martinz <amartinz@shiftphones.com>
Signed-off-by: Joey <joey@lineageos.org>