CDROM: Double audio FIFO low watermark size

Gives a better chance to catch up in case of desyncs.

src/core/cdrom.h

@@ -68,7 +68,7 @@ private:
     DATA_FIFO_SIZE = RAW_SECTOR_OUTPUT_SIZE,
     NUM_SECTOR_BUFFERS = 8,
     AUDIO_FIFO_SIZE = 44100 * 2,
-    AUDIO_FIFO_LOW_WATERMARK = 5,
+    AUDIO_FIFO_LOW_WATERMARK = 10,
 
     BASE_RESET_TICKS = 400000,