Fix error when loading embedded audio.
Fix error when loading embedded audio.

`loadAudioBuffer` skipped actually creating an `AudioBuffer`. Oops!
Fortunately, `getAudioBuffer` works fine, so I copied that code.

player-03/lime,player-03/lime,player-03/lime,openfl/lime,player-03/lime,player-03/lime,openfl/lime,openfl/lime,openfl/lime,player-03/lime,openfl/lime,openfl/lime,player-03/lime,openfl/lime