Tidy up audio play

It doesn't seem to matter that audio.play() gets called each update. If there's much overhead to doing so, I'll change it.

gdx-video-desktop/src/com/badlogic/gdx/video/CommonVideoPlayerDesktop.java

@@ -152,12 +152,8 @@ private int readFileContents (ByteBuffer buffer) {
 	@Override
 	public boolean update () {
 		if (decoder != null && (!paused || isFirstFrame) && playing) {
-			if (!paused && currentVideoTime == 0) {
-				// Since startTime is 0, this means that we should now display the first frame of the video, and set the
-				// time.
-				if (audio != null) {
-					audio.play();
-				}
+			if (!paused && audio != null) {
+				audio.play();
 			}
 
 			boolean newFrame = false;