SystemUI: Clean up old H+ drawables causing issues on manta

These drawables seem to be adapted to fit the old combined
tablet status bar. They mistakenly gets used on manta with
an oversized H+ drawable as a result.
Allow applications to show the navigation bar in expanded desktop mode.

This is used by the settings app to show the navigation bar when editing
it.
Pie Controls: Fix snap points position.

This commit reverts an error, introduced by the second pie
service commit, which causes the positions where the snap points
gets displayed to be inverted.
Pie Controls: Fix sound effects.

After the pie service commits, sound effects were broken for
HOME and BACK keys.

This commit fixes this, by moving the play back of the sound
effect from the injection directly to the onClick().